The 1991 Buick Roadmaster has 201 drivetrain parts with verified fitment on this page — 26 part types and 25 brands, covering the 5.0L V8 engine. Each part includes a manufacturer part number and application notes.
On the 1991 Buick Roadmaster, the drivetrain system moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware. 87 parts of the 201 listed are Differential Pinion Bearing / Race (40 parts), Differential Rebuild Kit (33 parts) and Differential Carrier Bearing / Race (14 parts). The other 23 part types cover the remaining 114 parts.
The 1991 Buick Roadmaster came with a single engine, the 5.0L V8, and every part is verified against it.
25 brands supply drivetrain parts for the 1991 Buick Roadmaster, led by MOTIVE GEAR (49 parts), RICHMOND (33 parts) and SKF (15 parts), plus 22 more brands. Quality grades include Standard Replacement, Economy and Master Kit.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 1991 Buick Roadmaster. 37 parts have it, including USA STANDARD GEAR USA21278 (Axle Shaft) and RICHMOND XL5036 (Differential Carrier). Each part number opens a page with every vehicle that part fits.
Axle Shaft
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DANA | 2022652 | 🇺🇸 US 🇨🇦 CA | SVLLength: 31.81" | View on Amazon |
| DORMAN | 630118 | 🇺🇸 US 🇨🇦 CA | Fits Rear Left30 Spline | View on Amazon |
| DORMAN | 630118A | 🇺🇸 US 🇨🇦 CA | Does Not Include Bearing, Seal, or Hardware | View on Amazon |
| RICHMOND | 9225195 | 🇺🇸 US 🇨🇦 CA | Excel31.8" Overall Length | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| USA STANDARD GEAR Popular | USA21278 | 🇺🇸 US | 30 Spline30-3/8" Length | View on Amazon |
| USA STANDARD GEAR | ZAK630118 | 🇺🇸 US 🇨🇦 CA | Axle Shaft KitIncludes Axle, Wheel Bearing, Seal, Studs & Lug Nuts | View on Amazon |
| USA STANDARD GEAR | USA10208 | 🇺🇸 US 🇨🇦 CA | 31.8" Length30 Spline | View on Amazon |
This table covers the Axle shafts.
7 Axle Shaft parts for the 1991 Buick Roadmaster come from 4 brands — USA STANDARD GEAR, DORMAN, DANA and 1 other brand. The "Popular" part is USA STANDARD GEAR USA21278.
The Economy section lists 4 options from DORMAN, DANA and RICHMOND — the catalog's value-priced group. DANA 2022652 is listed in this group.
In the Standard Replacement grade, USA STANDARD GEAR supplies 3 parts: built to original-equipment specification. A representative part number is USA STANDARD GEAR USA21278.
Part numbers include USA STANDARD GEAR USA21278, DANA 2022652 and DORMAN 630118, among others listed above.
Axle Shaft Bearing
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MEVOTECH | HRP6408 | 🇺🇸 US 🇨🇦 CA | Repair Bearing | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO | RP6408 | 🇺🇸 US 🇨🇦 CA | Gold / ProfessionalRepair Bearing | View on Amazon |
| BCA | NBRP6408 | 🇺🇸 US 🇨🇦 CA | Repair Bearing | View on Amazon |
| SCHAEFFLER | 102549 | 🇺🇸 US 🇨🇦 CA | Repair Bearing | View on Amazon |
This table covers the Axle Shaft bearings. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly.
4 Axle Shaft Bearing parts for the 1991 Buick Roadmaster come from 4 brands — MEVOTECH, ACDELCO, BCA and 1 other brand.
The Economy section: 1 option from MEVOTECH. MEVOTECH HRP6408 is listed in this group.
Standard Replacement: 3 parts, from ACDELCO, BCA and SCHAEFFLER. A representative part number is ACDELCO RP6408.
This group includes MEVOTECH HRP6408, ACDELCO RP6408 and BCA NBRP6408 and the remaining parts above.
Axle Shaft Retainer / Clip
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 81050 | 🇺🇸 US 🇨🇦 CA | Axle Shaft Lock Assortment | View on Amazon |
| GM GENUINE | 03833322 | 🇺🇸 US 🇨🇦 CA | Rear Axle8.50/8.625 Ring Gear Saginaw - American Axle | View on Amazon |
| MOTIVE GEAR | 3833322 | 🇺🇸 US 🇨🇦 CA | RearGM 8.5"/8.625" | View on Amazon |
| MOTIVE GEAR | 344171 | 🇺🇸 US 🇨🇦 CA | RearGM 7.5"/7.625" | View on Amazon |
This table covers the Axle Shaft retainers and clips.
4 Axle Shaft Retainer / Clip parts are listed for the 1991 Buick Roadmaster, from MOTIVE GEAR, DORMAN and GM GENUINE.
This group includes DORMAN 81050, GM GENUINE 03833322 and MOTIVE GEAR 3833322 and the remaining parts above.
Axle Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NATIONAL | 8835S | 🇺🇸 US 🇨🇦 CA | Rear | View on Amazon |
This table covers the seals where an axle shaft exits the housing. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
One part is listed for the 1991 Buick Roadmaster — NATIONAL 8835S.
Differential Carrier
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| RICHMOND Popular | XL5036 | 🇺🇸 US 🇨🇦 CA | EXCel | View on Amazon |
| RICHMOND | XL5045 | 🇺🇸 US 🇨🇦 CA | EXCel | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTIVE GEAR Popular | GM86L | 🇺🇸 US 🇨🇦 CA | 30 Spline | View on Amazon |
| MOTIVE GEAR | GM76L | 🇺🇸 US 🇨🇦 CA | RearGM 7.625" (10 Bolt) | View on Amazon |
| MOTIVE GEAR | 26010481 | 🇺🇸 US 🇨🇦 CA | Differential Gear Case1.31 in. Dia 28/30 Spline | View on Amazon |
| MOTIVE GEAR | GM10L30 | 🇺🇸 US 🇨🇦 CA | 30 SplineDifferential Gear Case Kit | View on Amazon |
| MOTIVE GEAR | GM76E | 🇺🇸 US 🇨🇦 CA | RearGM 7.625" (10 Bolt) | View on Amazon |
This table covers the carriers that hold the differential gears in the axle.
7 Differential Carrier parts are listed for the 1991 Buick Roadmaster, from MOTIVE GEAR and RICHMOND. RICHMOND XL5036 carries the "Popular" badge.
Economy: 2 parts, from RICHMOND. A representative part number is RICHMOND XL5036.
The Standard Replacement section: 5 options from MOTIVE GEAR. MOTIVE GEAR GM86L is listed in this group.
Listed part numbers: RICHMOND XL5036, RICHMOND XL5045 and MOTIVE GEAR GM86L, plus the other parts above.
Differential Carrier Bearing / Race
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MEVOTECH | HLM501349 | 🇺🇸 US 🇨🇦 CA | Rear | View on Amazon |
| WJB / INMOTION PARTS | WTLM501314 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| WJB / INMOTION PARTS | WTLM501349 | 🇺🇸 US 🇨🇦 CA | Rearwith 8.5 IN Ring Gear | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SKF Popular | BR72 | 🇺🇸 US 🇨🇦 CA | Rearwith 7.50 Ring Gear | View on Amazon |
| TIMKEN Popular | LM501314 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| TIMKEN Popular | LM501349 | 🇺🇸 US 🇨🇦 CA | Rear | View on Amazon |
| ACDELCO | S13 | 🇺🇸 US 🇨🇦 CA | GM Original EquipmentIncludes Cup & Cone | View on Amazon |
| BCA | NBLM501314 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| BCA | NBLM501349 | 🇺🇸 US 🇨🇦 CA | Rearwith GMC Axle(s) | View on Amazon |
| GM GENUINE | S1413 | 🇺🇸 US 🇨🇦 CA | Includes Cup and Cone | View on Amazon |
| RICHMOND | 2900131 | 🇺🇸 US 🇨🇦 CA | Bearing & Race Kit or Differential Bearing Kit | View on Amazon |
| SCHAEFFLER | LM501314 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| SCHAEFFLER | KLM501349 | 🇺🇸 US 🇨🇦 CA | Bearing Only | View on Amazon |
| SKF | LM501314VP | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
This table covers the bearings and races that support the differential carrier.
14 Differential Carrier Bearing / Race parts are listed for the 1991 Buick Roadmaster, from WJB / INMOTION PARTS, SKF, TIMKEN and 6 other brands. SKF BR72 carries the "Popular" badge.
Economy: 3 parts, from WJB / INMOTION PARTS and MEVOTECH. A representative part number is MEVOTECH HLM501349.
The Standard Replacement section: 11 options from SKF, TIMKEN, BCA and 4 other brands. SKF BR72 is listed in this group.
Differential Carrier Shim
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTIVE GEAR Popular | SS12 | 🇺🇸 US 🇨🇦 CA | Super shimsStackable Carrier Shim Kit | View on Amazon |
| RICHMOND Popular | 3800061 | 🇺🇸 US 🇨🇦 CA | Kit | View on Amazon |
| MOTIVE GEAR | SS10 | 🇺🇸 US 🇨🇦 CA | Differential Carrier Shim Kit | View on Amazon |
| MOTIVE GEAR | GM10MSK | 🇺🇸 US 🇨🇦 CA | Differential Carrier Shim Kit or Differential Carrier and pinion shim Kit | View on Amazon |
| MOTIVE GEAR | GM75MSK | 🇺🇸 US 🇨🇦 CA | Carrier And Pinion Shim Kit | View on Amazon |
| RICHMOND | 3800071 | 🇺🇸 US 🇨🇦 CA | Kit | View on Amazon |
This table covers the Differential Carrier shims.
6 Differential Carrier Shim parts for the 1991 Buick Roadmaster come from 2 brands — MOTIVE GEAR and RICHMOND. The "Popular" part is MOTIVE GEAR SS12.
Part numbers include MOTIVE GEAR SS12, RICHMOND 3800061 and MOTIVE GEAR SS10, among others listed above.
Differential Cover
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Popular | 697700 | 🇺🇸 US 🇨🇦 CA | Rear8.5" Ring Gear | View on Amazon |
| SKP Popular | SK697700 | 🇺🇸 US 🇨🇦 CA | Fits Rear8.5" Ring Gear | View on Amazon |
| AAM | 40027020 | 🇺🇸 US 🇨🇦 CA | Rearwith 10 Bolt Cover | View on Amazon |
| AAM | 40039162 | 🇺🇸 US 🇨🇦 CA | Rearwith 8.5 (In) Axle | View on Amazon |
| AAM | 74030007 | 🇺🇸 US 🇨🇦 CA | Rearwith 10 Bolt Cover | View on Amazon |
| ATP | 111101 | 🇺🇸 US 🇨🇦 CA | Includes Gasket and Internal Magnet | View on Amazon |
This table covers the Differential covers.
6 Differential Cover parts for the 1991 Buick Roadmaster come from 4 brands — AAM, DORMAN, SKP and 1 other brand. The "Popular" part is DORMAN 697700.
Listed part numbers: DORMAN 697700, SKP SK697700 and AAM 40027020, plus the other parts above.
Differential Cover Bolt
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AAM | 4000216910 | 🇺🇸 US 🇨🇦 CA | Set | View on Amazon |
| AAM | 40002169 | 🇺🇸 US 🇨🇦 CA | Rearwith 8.5 (In) Axle | View on Amazon |
This table covers the Differential Cover bolts.
AAM supplies both parts for the 1991 Buick Roadmaster.
Listed part numbers: AAM 4000216910 and AAM 40002169.
Differential Cover Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO Popular | RDS550281 | 🇺🇸 US 🇨🇦 CA | Rearwith 8.5 (In) Ring Gear | View on Amazon |
| GM GENUINE Popular | 15807693 | 🇺🇸 US 🇨🇦 CA | Rear8.50/8.625 Ring Gear Saginaw - American Axle | View on Amazon |
| AAM | 40018901 | 🇺🇸 US 🇨🇦 CA | with 8.5 (In) Rear AxleAxle Housing Cover | View on Amazon |
| DORMAN | 926050 | 🇺🇸 US 🇨🇦 CA | Includes Bolts | View on Amazon |
| MAHLE / CLEVITE | P27857 | 🇺🇸 US 🇨🇦 CA | Paper | View on Amazon |
| MAHLE / CLEVITE | P27857TC | 🇺🇸 US 🇨🇦 CA | Cork with Metal CarrierAxle Housing Cover Gasket | View on Amazon |
| MOTIVE GEAR | 3993593 | 🇺🇸 US 🇨🇦 CA | RearGM 8.5"/8.625" (10 Bolt) | View on Amazon |
| MOTIVE GEAR | 5110 | 🇺🇸 US 🇨🇦 CA | RearGM 7.5"/7.625" (10 Bolt) | View on Amazon |
| VICTOR REINZ | 711482200 | 🇺🇸 US 🇨🇦 CA | Rearwith 8.500 IN Ring Gear | View on Amazon |
This table covers the gaskets that seal the Differential Cover. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for.
9 Differential Cover Gasket parts are listed for the 1991 Buick Roadmaster, from MAHLE / CLEVITE, MOTIVE GEAR, FEL-PRO and 4 other brands. FEL-PRO RDS550281 carries the "Popular" badge.
This group includes FEL-PRO RDS550281, GM GENUINE 15807693 and AAM 40018901 and the remaining parts above.
Differential Cross Pin
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Popular | 84565109 | 🇺🇸 US 🇨🇦 CA | 8.50/8.625 Ring Gear Saginaw - American Axle10 Bolt Differential | View on Amazon |
| MOTIVE GEAR Popular | 14006401 | 🇺🇸 US 🇨🇦 CA | Differential Pinion Shaft | View on Amazon |
| AAM | 40048063 | 🇺🇸 US 🇨🇦 CA | Rearwith 10 Bolt Cover | View on Amazon |
| RICHMOND | CSPGM85 | 🇺🇸 US 🇨🇦 CA | Differential Pinion Shaft | View on Amazon |
| RICHMOND | XL5640 | 🇺🇸 US 🇨🇦 CA | EXCelDifferential Pinion Shaft | View on Amazon |
| RICHMOND | CSPGM75 | 🇺🇸 US 🇨🇦 CA | Differential Pinion Shaft | View on Amazon |
| RICHMOND | XL5630 | 🇺🇸 US 🇨🇦 CA | EXCelDifferential Pinion Shaft | View on Amazon |
| RICHMOND | 8002721 | 🇺🇸 US 🇨🇦 CA | Differential Pinion Shaft | View on Amazon |
This table covers the Differential Cross pins.
8 Differential Cross Pin parts for the 1991 Buick Roadmaster come from 4 brands — RICHMOND, GM GENUINE, MOTIVE GEAR and 1 other brand. The "Popular" part is GM GENUINE 84565109.
Part numbers include GM GENUINE 84565109, MOTIVE GEAR 14006401 and AAM 40048063, among others listed above.
Differential Crush Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AAM | 400103551 | 🇺🇸 US 🇨🇦 CA | Rear | View on Amazon |
| RICHMOND | 1900041 | 🇺🇸 US 🇨🇦 CA | RearGM 8.25" IFS, 8.5"/8.625" | View on Amazon |
This table covers the Differential Crush sleeves.
2 Differential Crush Sleeve parts for the 1991 Buick Roadmaster come from 2 brands — AAM and RICHMOND.
This group includes AAM 400103551 and RICHMOND 1900041.
Differential Fill / Drain Plug
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AAM | 40007601 | 🇺🇸 US 🇨🇦 CA | with 8.5 (In) Rear Axle | View on Amazon |
This table covers the Differential Fill drain plugs.
One part is listed for the 1991 Buick Roadmaster — AAM 40007601.
Differential Gear Installation Kit
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| RICHMOND Popular | 831021B | 🇺🇸 US 🇨🇦 CA | Install Kit Includes Brush, Cover Gasket (or RTV), Crush Sleeve (or Preload Shim Pack), Marking Compound, Pinion Nut, Pinion Seal, Ring Gear Bolts, Shims (Pinion, Carrier), and Thread Locking Compound | View on Amazon |
| RICHMOND Popular | XL1021B | 🇺🇸 US 🇨🇦 CA | EXCel | View on Amazon |
| MOTIVE GEAR | GM85IK | 🇺🇸 US 🇨🇦 CA | Differential Gear Install Kit | View on Amazon |
| MOTIVE GEAR | GM75IK | 🇺🇸 US 🇨🇦 CA | Differential Gear Install Kit | View on Amazon |
| RICHMOND | XL1044B | 🇺🇸 US 🇨🇦 CA | EXCel | View on Amazon |
| RICHMOND | 831044B | 🇺🇸 US 🇨🇦 CA | Install Kit Includes Brush, Cover Gasket (or RTV), Crush Sleeve (or Preload Shim Pack), Marking Compound, Pinion Nut, Pinion Seal, Ring Gear Bolts, Shims (Pinion, Carrier), and Thread Locking Compound | View on Amazon |
This table covers the Differential Gear Installation kits.
6 Differential Gear Installation Kit parts for the 1991 Buick Roadmaster come from 2 brands — RICHMOND and MOTIVE GEAR. The "Popular" part is RICHMOND 831021B.
Part numbers include RICHMOND 831021B, RICHMOND XL1021B and MOTIVE GEAR GM85IK, among others listed above.
Differential Pinion Bearing / Race
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WJB / INMOTION PARTS Popular | WTM88048 | 🇺🇸 US 🇨🇦 CA | Bearing Shape: Cylindrical | View on Amazon |
| FAMOUS BRAND | SM802011 | 🇺🇸 US 🇨🇦 CA | RearInner | View on Amazon |
| FAMOUS BRAND | SM88010 | 🇺🇸 US 🇨🇦 CA | RearOUTER | View on Amazon |
| FAMOUS BRAND | SM802048 | 🇺🇸 US 🇨🇦 CA | RearInner | View on Amazon |
| ULTRA-POWER | WTM88048 | 🇺🇸 US 🇨🇦 CA | RearOUTER | View on Amazon |
| ULTRA-POWER | WTM802048 | 🇺🇸 US 🇨🇦 CA | RearINNER | View on Amazon |
| WJB / INMOTION PARTS | WTM802011 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| WJB / INMOTION PARTS | WTM88010 | 🇺🇸 US 🇨🇦 CA | RaceCup Outside Diameter (In): 2.6880000000000002 In | View on Amazon |
| WJB / INMOTION PARTS | WTNP926068 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| WJB / INMOTION PARTS | WTM802048 | 🇺🇸 US 🇨🇦 CA | Bearing Shape: Cylindrical | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SKF Popular | BR52 | 🇺🇸 US 🇨🇦 CA | Rear Outerwith 8.50 Ring Gear | View on Amazon |
| TIMKEN Popular | M88010 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| TIMKEN Popular | M802011 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| TIMKEN Popular | M88048 | 🇺🇸 US 🇨🇦 CA | Rear Outer | View on Amazon |
| TIMKEN Popular | M802048 | 🇺🇸 US 🇨🇦 CA | Rear Inner | View on Amazon |
| ACDELCO | M86610X | 🇺🇸 US 🇨🇦 CA | GoldRace | View on Amazon |
| BCA | NBM88010 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| BCA | NBM802011 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| BCA | NBM88048 | 🇺🇸 US 🇨🇦 CA | Bearing Shape: Cylindrical | View on Amazon |
| BCA | NBM802048 | 🇺🇸 US 🇨🇦 CA | Bearing Shape: Cylindrical | View on Amazon |
| BCA | NBBR52 | 🇺🇸 US 🇨🇦 CA | Bearing & Race | View on Amazon |
| GM GENUINE | 09413427 | 🇺🇸 US 🇨🇦 CA | Outerwith Cup | View on Amazon |
| GM GENUINE | S1420 | 🇺🇸 US 🇨🇦 CA | Inner8.50/8.625 Ring Gear Saginaw - American Axle | View on Amazon |
| MOTIVE GEAR | 706016XR | 🇺🇸 US 🇨🇦 CA | Koyo Bearings | View on Amazon |
| MOTIVE GEAR | R10RPK | 🇺🇸 US 🇨🇦 CA | KitKoyo Bearings | View on Amazon |
| MOTIVE GEAR | R75GRTPK | 🇺🇸 US 🇨🇦 CA | Pinion Bearing Kit Includes Timken Pinion Bearings, Brush, Crush Sleeve, Marking Compound, Pinion Nut, Pinion Seal, Pinion Shims, and Thread Locking Compound | View on Amazon |
| MOTIVE GEAR | R10RTPK | 🇺🇸 US 🇨🇦 CA | Pinion Bearing Kit Includes Timken Pinion Bearings, Brush, Crush Sleeve, Marking Compound, Pinion Nut, Pinion Seal, Pinion Shims, and Thread Locking Compound | View on Amazon |
| SCHAEFFLER | M88010 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| SCHAEFFLER | KM86649 | 🇺🇸 US 🇨🇦 CA | Repair | View on Amazon |
| SCHAEFFLER | KM802048 | 🇺🇸 US 🇨🇦 CA | Rear | View on Amazon |
| SCHAEFFLER | KT63 | 🇺🇸 US 🇨🇦 CA | Rear Outer8.50" Ring Gear | View on Amazon |
| SCHAEFFLER | KM88048 | 🇺🇸 US 🇨🇦 CA | Rear Outer1.313 In Inside Diameter X 2.688 In Outside Diameter X 0.875 In Thick | View on Amazon |
| SCHAEFFLER | HM89210 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| SCHAEFFLER | KHM89249 | 🇺🇸 US 🇨🇦 CA | Rear Inner28.8290 mm Width | View on Amazon |
| SKF | M86610VP | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| SKF | M88010VP | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| SKF | HM89210 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| SKF | NP926068 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| SKF | HM89249 | 🇺🇸 US 🇨🇦 CA | 1.156" Widthwith 1.437 In. Bearing Inside Diameter | View on Amazon |
| SKF | NP457992 | 🇺🇸 US 🇨🇦 CA | with 1.6250 In. Bearing Inside Diameter | View on Amazon |
This table covers the bearings and races on the differential pinion.
40 Differential Pinion Bearing / Race parts for the 1991 Buick Roadmaster come from 10 brands — SKF, SCHAEFFLER, WJB / INMOTION PARTS and 7 other brands. The "Popular" part is WJB / INMOTION PARTS WTM88048. Grades run from Economy through Standard Replacement; Standard Replacement is the most populated section, led by SKF, SCHAEFFLER, BCA and 4 other brands.
Differential Pinion Bearing Baffle
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | 12479162 | 🇺🇸 US 🇨🇦 CA | .062-.068 THK | View on Amazon |
| MOTIVE GEAR | 4111 | 🇺🇸 US 🇨🇦 CA | Differential Pinion Bearing Spacer | View on Amazon |
This table covers the baffles that control oil at the pinion bearings.
2 Differential Pinion Bearing Baffle parts for the 1991 Buick Roadmaster come from 2 brands — GM GENUINE and MOTIVE GEAR.
This group includes GM GENUINE 12479162 and MOTIVE GEAR 4111.
Differential Pinion Nut
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOTIVE GEAR Popular | 1260823 | 🇺🇸 US 🇨🇦 CA | Differential Pinion Shaft NutPinion Nut | View on Amazon |
| AAM | 9783762 | 🇺🇸 US 🇨🇦 CA | with 8.5 (In) Rear Axle | View on Amazon |
| AAM | 97837621 | 🇺🇸 US 🇨🇦 CA | with 8.5 (In) Rear AxleDrive Pinion Nut | View on Amazon |
| GM GENUINE | 09783762 | 🇺🇸 US 🇨🇦 CA | 8.50/8.625 Ring Gear Saginaw - American Axle10 Bolt Differential | View on Amazon |
| GM GENUINE | 88891763 | 🇺🇸 US 🇨🇦 CA | M108.50/8.625 Ring Gear Saginaw - American Axle | View on Amazon |
This table covers the Differential Pinion nuts.
5 Differential Pinion Nut parts are listed for the 1991 Buick Roadmaster, from AAM, GM GENUINE and MOTIVE GEAR. MOTIVE GEAR 1260823 carries the "Popular" badge.
Listed part numbers: MOTIVE GEAR 1260823, AAM 9783762 and AAM 97837621, plus the other parts above.
Differential Pinion Repair Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WJB / INMOTION PARTS Popular | WS99193 | 🇺🇸 US 🇨🇦 CA | Rear Outerwith 8.5 IN Ring Gear | View on Amazon |
| SCHAEFFLER | SR3509 | 🇺🇸 US 🇨🇦 CA | RearCommercial Chassis | View on Amazon |
| SCHAEFFLER | SR3479 | 🇺🇸 US 🇨🇦 CA | Rearwith 7.50 In Ring Gear | View on Amazon |
| SKF | 99152 | 🇺🇸 US 🇨🇦 CA | Shaft Diameter: 1.523 In | View on Amazon |
| SKF | 99193 | 🇺🇸 US 🇨🇦 CA | Shaft Diameter: 1.937 In | View on Amazon |
This table covers the wear sleeves used to restore a grooved pinion seal surface.
5 Differential Pinion Repair Sleeve parts are listed for the 1991 Buick Roadmaster, from SCHAEFFLER, SKF and WJB / INMOTION PARTS. WJB / INMOTION PARTS WS99193 carries the "Popular" badge.
This group includes WJB / INMOTION PARTS WS99193, SCHAEFFLER SR3509 and SCHAEFFLER SR3479 and the remaining parts above.
Differential Pinion Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SKF Popular | 19273 | 🇺🇸 US 🇨🇦 CA | Rearwith 8.5 Ring Gear | View on Amazon |
| TIMKEN Popular | 2043 | 🇺🇸 US 🇨🇦 CA | Rear | View on Amazon |
| BCA | NS2043 | 🇺🇸 US 🇨🇦 CA | Rear Outerwith GMC Axle(s) | View on Amazon |
| GM GENUINE | 26064028 | 🇺🇸 US 🇨🇦 CA | Rear Axle8.50/8.625 Ring Gear Saginaw - American Axle | View on Amazon |
| MOTIVE GEAR | 8610 | 🇺🇸 US 🇨🇦 CA | RearGM 7.5"/7.625" (10 Bolt) | View on Amazon |
| MOTIVE GEAR | 2043 | 🇺🇸 US 🇨🇦 CA | RearGM 8.25" IFS, 8.5" | View on Amazon |
| SCHAEFFLER | SS2983 | 🇺🇸 US 🇨🇦 CA | RearCommercial Chassis | View on Amazon |
| SCHAEFFLER | SS2588 | 🇺🇸 US 🇨🇦 CA | Rearwith 7.50 In Ring Gear | View on Amazon |
| SKF | 15315 | 🇺🇸 US 🇨🇦 CA | Rearwith 7.5 Ring Gear | View on Amazon |
| WJB / INMOTION PARTS | WS2043 | 🇺🇸 US 🇨🇦 CA | Rear Outerwith 8.5 IN Ring Gear | View on Amazon |
This table covers the seals at the differential pinion yoke. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
10 Differential Pinion Seal parts are listed for the 1991 Buick Roadmaster, from SKF, MOTIVE GEAR, SCHAEFFLER and 4 other brands. SKF 19273 carries the "Popular" badge.
Differential Pinion Shaft Lock Bolt
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 81048 | 🇺🇸 US 🇨🇦 CA | Differential Shaft Lock Bolt | View on Amazon |
| GM GENUINE | 25872305 | 🇺🇸 US 🇨🇦 CA | .3X18X30, 12.7THD | View on Amazon |
| MOTIVE GEAR | 14056196 | 🇺🇸 US 🇨🇦 CA | RearGM 7.5"/7.625" (10 Bolt) | View on Amazon |
This table covers the Differential Pinion Shaft Lock bolts.
3 Differential Pinion Shaft Lock Bolt parts for the 1991 Buick Roadmaster come from 3 brands — DORMAN, GM GENUINE and MOTIVE GEAR.
Part numbers include DORMAN 81048, GM GENUINE 25872305 and MOTIVE GEAR 14056196.
Differential Pinion Shim
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| RICHMOND Popular | 1600901 | 🇺🇸 US 🇨🇦 CA | Rear DifferentialGM 8.5/8.625" | View on Amazon |
| GM GENUINE | 52030095 | 🇺🇸 US 🇨🇦 CA | .020.025 THK | View on Amazon |
| MOTIVE GEAR | 1100 | 🇺🇸 US 🇨🇦 CA | Pinion Shim Pack | View on Amazon |
| MOTIVE GEAR | 1104 | 🇺🇸 US 🇨🇦 CA | Pinion Shim Pack | View on Amazon |
| RICHMOND | 3800191 | 🇺🇸 US 🇨🇦 CA | Rear DifferentialGM 7.5"/7.625" | View on Amazon |
This table covers the Differential Pinion shims.
5 Differential Pinion Shim parts are listed for the 1991 Buick Roadmaster, from RICHMOND, MOTIVE GEAR and GM GENUINE. RICHMOND 1600901 carries the "Popular" badge.
Listed part numbers: RICHMOND 1600901, GM GENUINE 52030095 and MOTIVE GEAR 1100, plus the other parts above.
Differential Rebuild Kit
Master Kit
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| RICHMOND Popular | XL10441 | 🇺🇸 US 🇨🇦 CA | EXCel | View on Amazon |
| RICHMOND Popular | XL10211 | 🇺🇸 US 🇨🇦 CA | EXCel | View on Amazon |
| RICHMOND Popular | 8310211 | 🇺🇸 US 🇨🇦 CA | Master KitTimken Bearings | View on Amazon |
| BCA | NBRA320MK | 🇺🇸 US 🇨🇦 CA | Master Kit | View on Amazon |
| DORMAN | 797102 | 🇺🇸 US 🇨🇦 CA | Rear7.5" Ring Gear | View on Amazon |
| DORMAN | 697102 | 🇺🇸 US 🇨🇦 CA | Rear7.5" Ring Gear | View on Amazon |
| LUK | GDK320MK | 🇺🇸 US 🇨🇦 CA | Master Kit | View on Amazon |
| MOTIVE GEAR | R75GRMK | 🇺🇸 US 🇨🇦 CA | Rear7.5" Ring Gear | View on Amazon |
| MOTIVE GEAR | R10REMK | 🇺🇸 US 🇨🇦 CA | Master Bearing Kit Includes Koyo Tapered Bearings, Brush, Cover Gasket (or RTV), Crush Sleeve (or Preload Shim Pack), Marking Compound, Pinion Nut | View on Amazon |
| MOTIVE GEAR | R10RMKT | 🇺🇸 US 🇨🇦 CA | with Timken Bearings | View on Amazon |
| MOTIVE GEAR | R10REMKT | 🇺🇸 US 🇨🇦 CA | Master Bearing Kit Includes Timken Tapered Bearings, Brush, Cover Gasket (or RTV), Crush Sleeve (or Preload Shim Pack), Marking Compound, Pinion Nut | View on Amazon |
| MOTIVE GEAR | R75GRMKT | 🇺🇸 US 🇨🇦 CA | Master Bearing Kit Includes Timken Tapered Bearings , Brush, Cover Gasket (or RTV), Crush Sleeve or Preloa | View on Amazon |
| RICHMOND | 8310441 | 🇺🇸 US 🇨🇦 CA | Master KitTimken Bearings | View on Amazon |
| SKF | SDK320MK | 🇺🇸 US 🇨🇦 CA | Master Kit | View on Amazon |
| TIMKEN | DRK321MK | 🇺🇸 US 🇨🇦 CA | Master Kit | View on Amazon |
Mega Kit
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| RICHMOND Popular | 831021M | 🇺🇸 US 🇨🇦 CA | Mega KitTimken Bearings | View on Amazon |
| RICHMOND Popular | 831044M | 🇺🇸 US 🇨🇦 CA | Mega KitTimken Bearings | View on Amazon |
| MOTIVE GEAR | R10RSK | 🇺🇸 US 🇨🇦 CA | Super Bearing Kit Includes Koyo Tapered Bearings, Brush, Cover Gasket (or RTV), Crush Sleeve (or Preload Shim Pack), Marking Compound, Pinion Nut | View on Amazon |
| MOTIVE GEAR | R75GRSK | 🇺🇸 US 🇨🇦 CA | Super Bearing Kit Includes Koyo Tapered Bearings , Brush, Cover Gasket (or RTV), Crush Sleeve or Pre | View on Amazon |
| MOTIVE GEAR | R10RSKT | 🇺🇸 US 🇨🇦 CA | Super Bearing Kit Includes Timken Tapered Bearings, Brush, Cover Gasket (or RTV), Crush Sleeve (or Preload Shim Pack), Marking Compound, Pinion Nut | View on Amazon |
| MOTIVE GEAR | R75GRSKT | 🇺🇸 US 🇨🇦 CA | Super Bearing Kit Includes Timken Tapered Bearings , Brush, Cover Gasket (or RTV), Crush Sleeve or P | View on Amazon |
Standard Kit
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TIMKEN Popular | DRK321 | 🇺🇸 US 🇨🇦 CA | RearStandard | View on Amazon |
| AAM | 74067026 | 🇺🇸 US 🇨🇦 CA | with 8.5 (In) Rear Axlewith 10 Bolt Cover | View on Amazon |
| BCA | NBRA320 | 🇺🇸 US 🇨🇦 CA | Standard Kit | View on Amazon |
| LUK | GDK320 | 🇺🇸 US 🇨🇦 CA | Standard Kit | View on Amazon |
| MOTIVE GEAR | R10R | 🇺🇸 US 🇨🇦 CA | RearStandard | View on Amazon |
| MOTIVE GEAR | R75GR | 🇺🇸 US 🇨🇦 CA | Bearing Kit Includes Koyo Tapered Bearings, Brush, Cover Gasket (or RTV), Crush Sleeve (or Preload Shim Pack) | View on Amazon |
| MOTIVE GEAR | R10RT | 🇺🇸 US 🇨🇦 CA | Bearing Kit Includes Timken Tapered Bearings, Brush, Cover Gasket (or RTV), Crush Sleeve (or Preload Shim Pack), Marking Compound, Pinion Nut, Pinion Seal, and Thread Locking Compound | View on Amazon |
| MOTIVE GEAR | R10RET | 🇺🇸 US 🇨🇦 CA | Bearing Kit Includes Timken Tapered Bearings, Brush, Cover Gasket (or RTV), Crush Sleeve (or Preload Shim Pack), Marking Compound, Pinion Nut | View on Amazon |
| MOTIVE GEAR | R10RE | 🇺🇸 US 🇨🇦 CA | Bearing Kit Includes Koyo Tapered Bearings, Brush, Cover Gasket (or RTV), Crush Sleeve (or Preload Shim Pack), Marking Compound, Pinion Nut, Pinio | View on Amazon |
| MOTIVE GEAR | R75GRT | 🇺🇸 US 🇨🇦 CA | Bearing Kit Includes Timken Tapered Bearings , Brush, Cover Gasket (or RTV), Crush Sleeve or Preload Shim | View on Amazon |
| SKF | SDK320 | 🇺🇸 US 🇨🇦 CA | Standard Kit | View on Amazon |
| WJB / INMOTION PARTS | WKRA321 | 🇺🇸 US 🇨🇦 CA | Rearwith 8.5 IN Ring Gear | View on Amazon |
This table covers kits that group the bearings, races and seals for a differential rebuild.
33 Differential Rebuild Kit parts for the 1991 Buick Roadmaster come from 9 brands — MOTIVE GEAR, RICHMOND, BCA and 6 other brands. The "Popular" part is RICHMOND XL10441. Grades run from Master Kit through Standard Kit; Master Kit is the most populated section, led by MOTIVE GEAR, RICHMOND, DORMAN and 4 other brands.
Differential Ring Gear Bolt
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AAM | 40061033 | 🇺🇸 US 🇨🇦 CA | 7/16" x 20 x .88" - Left Hand 6 PT Serrated Hex with Adhesivewith 8.5 (In) Rear Axle | View on Amazon |
| GM GENUINE | 11610549 | 🇺🇸 US 🇨🇦 CA | 8.50/8.625 Ring Gear Saginaw - American Axle10 Bolt Differential | View on Amazon |
| MOTIVE GEAR | 14066913 | 🇺🇸 US 🇨🇦 CA | Ring Gear Bolt | View on Amazon |
| MOTIVE GEAR | PB1792L | 🇺🇸 US 🇨🇦 CA | Rear DifferentialGM 7.5"/7.625" | View on Amazon |
This table covers the Differential Ring Gear bolts.
4 Differential Ring Gear Bolt parts are listed for the 1991 Buick Roadmaster, from MOTIVE GEAR, AAM and GM GENUINE.
Part numbers include AAM 40061033, GM GENUINE 11610549 and MOTIVE GEAR 14066913, among others listed above.
Differential Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING | 782390 | 🇺🇸 US 🇨🇦 CA | InletBody code: BR35 | View on Amazon |
This table covers the seals at the Differential. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
This group shows a single part: ELRING 782390.
Differential Spider Gear
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| RICHMOND Popular | XL4050 | 🇺🇸 US 🇨🇦 CA | ExcelDifferential Carrier Gear Kit | View on Amazon |
| RICHMOND Popular | XL4042 | 🇺🇸 US 🇨🇦 CA | ExcelDifferential Carrier Gear Kit | View on Amazon |
| PRO-KING | 742G717A | 🇺🇸 US 🇨🇦 CA | Differential Gear SetRear Differential | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AAM | 74040441 | 🇺🇸 US 🇨🇦 CA | Differential Spider and Pinion Gear Kit | View on Amazon |
| MOTIVE GEAR | GM10BI30 | 🇺🇸 US 🇨🇦 CA | Differential Carrier Gear Kit30 Spline | View on Amazon |
| MOTIVE GEAR | GM76BI | 🇺🇸 US 🇨🇦 CA | Differential Carrier Gear Kit28 Spline | View on Amazon |
This table covers the Differential Spider gears.
6 Differential Spider Gear parts are listed for the 1991 Buick Roadmaster, from RICHMOND, MOTIVE GEAR, PRO-KING and 1 other brand. RICHMOND XL4050 carries the "Popular" badge.
Economy: 3 parts, from RICHMOND and PRO-KING. A representative part number is RICHMOND XL4050.
The Standard Replacement section: 3 options from MOTIVE GEAR and AAM. AAM 74040441 is listed in this group.
Part numbers include RICHMOND XL4050, RICHMOND XL4042 and PRO-KING 742G717A, among others listed above.
Differential Spool
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| RICHMOND Popular | 7875261 | 🇺🇸 US 🇨🇦 CA | Mini Spool | View on Amazon |
| RICHMOND Popular | XL5140 | 🇺🇸 US 🇨🇦 CA | ExcelDifferential Mini Spool | View on Amazon |
| MOTIVE GEAR | MS7526 | 🇺🇸 US 🇨🇦 CA | Differential Mini Spool26 Spline | View on Amazon |
| MOTIVE GEAR | FS1030 | 🇺🇸 US 🇨🇦 CA | 30 SplineFull Spool | View on Amazon |
| MOTIVE GEAR | FS1028 | 🇺🇸 US 🇨🇦 CA | 28 SplineFull Spool | View on Amazon |
| RICHMOND | XL5130 | 🇺🇸 US 🇨🇦 CA | ExcelDifferential Mini Spool | View on Amazon |
| RICHMOND | 7875281 | 🇺🇸 US 🇨🇦 CA | Mini Spool | View on Amazon |
| RICHMOND | 8110301 | 🇺🇸 US 🇨🇦 CA | RearGM 8.5" (10 Bolt) | View on Amazon |
| RICHMOND | 8110281 | 🇺🇸 US 🇨🇦 CA | RearGM 8.5" (10 Bolt) | View on Amazon |
| RICHMOND | 8110331 | 🇺🇸 US 🇨🇦 CA | RearGM 8.5" (10 Bolt) | View on Amazon |
This table covers the spools that lock the differential side gears together.
10 Differential Spool parts for the 1991 Buick Roadmaster come from 2 brands — RICHMOND and MOTIVE GEAR. The "Popular" part is RICHMOND 7875261.
Buying Drivetrain Parts for a 1991 Buick Roadmaster
On this vehicle, the drivetrain system moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware.
- Confirm you have the 5.0L V8 engine — every part on this page is matched to it.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace the differential or transfer-case fluid with any axle or seal job while everything is already open.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Differential Pinion Bearing / Race and Differential Rebuild Kit .
Frequently Asked Questions
How many drivetrain parts fit the 1991 Buick Roadmaster?
Our catalog currently lists 201 drivetrain parts for the 1991 Buick Roadmaster across 26 subcategories and 25 brands, covering the 5.0L V8 engine. Each part is matched to the engine(s) it fits.
What are the signs of drivetrain problems on a 1991 Buick Roadmaster?
Common symptoms include clicking in tight turns, a clunk when shifting between drive and reverse, vibration that builds with speed, or gear oil on the inside of a wheel. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace the differential or transfer-case fluid with any axle or seal job while everything is already open.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 1991 Buick Roadmaster was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 1991 Buick Roadmaster?
Every part on this page is matched to the 5.0L V8 engine. Then a torn CV boot caught early is a cheap boot kit; caught late it is a whole axle — inspect before deciding which to buy. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 1991 Buick Roadmaster
Drivetrain Parts for Other Buick Roadmaster Years
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