The 1990 Avanti Ii has 65 drivetrain parts with verified fitment on this page — 7 part types and 12 brands, covering the 5.0L 305cid V8 engine. Each part includes a manufacturer part number and application notes.
On the 1990 Avanti Ii, the drivetrain system moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware. 47 parts of the 65 listed are Differential Pinion Bearing / Race (32 parts), Differential Carrier Bearing / Race (8 parts) and Differential Pinion Seal (7 parts). The other 4 part types cover the remaining 18 parts.
The 1990 Avanti Ii came with a single engine, the 5.0L 305cid V8, and every part is verified against it.
12 brands supply drivetrain parts for the 1990 Avanti Ii, led by WJB / INMOTION PARTS (17 parts), TIMKEN (16 parts) and BCA (14 parts), plus 9 more brands. Quality grades include Standard Replacement, Economy and Standard Kit.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 1990 Avanti Ii. 12 parts have it, including TIMKEN M802011 (Differential Carrier Bearing / Race) and WJB / INMOTION PARTS WTM86649 (Differential Pinion Bearing / Race). Each part number opens a page with every vehicle that part fits.
Axle Shaft Bearing
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MEVOTECH | HRP5707 | 🇺🇸 US | Repair BearingOutside Diameter: 58.31 mm | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO | 5707 | 🇺🇸 US 🇨🇦 CA | Gold | View on Amazon |
| BCA | NBRP5707 | 🇺🇸 US | Repair Bearing | View on Amazon |
| MOTIVE GEAR | KIT5707 | 🇺🇸 US | Axle Differential Bearing and Seal Kit | 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 1990 Avanti Ii come from 4 brands — MEVOTECH, ACDELCO, BCA and 1 other brand.
The Economy section lists 1 option from MEVOTECH — the catalog's value-priced group. MEVOTECH HRP5707 is listed in this group.
In the Standard Replacement grade, ACDELCO, BCA and MOTIVE GEAR supply 3 parts: built to original-equipment specification. A representative part number is ACDELCO 5707.
This group includes MEVOTECH HRP5707, ACDELCO 5707 and BCA NBRP5707 and the remaining parts above.
Differential Carrier Bearing / Race
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WJB / INMOTION PARTS | WTLM501314 | 🇺🇸 US | Race | View on Amazon |
| WJB / INMOTION PARTS | WTLM501349 | 🇺🇸 US | Fits Rearwith 8.5 IN Ring Gear | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TIMKEN Popular | M802011 | 🇺🇸 US | Race | View on Amazon |
| TIMKEN Popular | M802048 | 🇺🇸 US | Rear Inner7.5", 8.8" Ring Gear | View on Amazon |
| BCA | NBLM501314 | 🇺🇸 US | Race | View on Amazon |
| BCA | NBLM501349 | 🇺🇸 US | Rearwith GMC Axle(s) | View on Amazon |
| TIMKEN | M88010 | 🇺🇸 US | Race | View on Amazon |
| TIMKEN | M88048 | 🇺🇸 US | Rear Outer7.5", 8.8" Ring Gear | View on Amazon |
This table covers the bearings and races that support the differential carrier.
8 Differential Carrier Bearing / Race parts are listed for the 1990 Avanti Ii, from TIMKEN, WJB / INMOTION PARTS and BCA. TIMKEN M802011 carries the "Popular" badge.
Economy: 2 parts, from WJB / INMOTION PARTS. A representative part number is WJB / INMOTION PARTS WTLM501314.
The Standard Replacement section: 6 options from TIMKEN and BCA. TIMKEN M802011 is listed in this group.
This group includes TIMKEN M802011, WJB / INMOTION PARTS WTLM501314 and WJB / INMOTION PARTS WTLM501349 and the remaining parts above.
Differential Cover Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO | RDS550281 | 🇺🇸 US | Rearwith 8.5 (In) Ring Gear | View on Amazon |
| FEL-PRO | RDS55072 | 🇺🇸 US | Rearwith 7.5 (In) Ring Gear | View on Amazon |
| VICTOR REINZ | 711482400 | 🇺🇸 US | Rearwith 7.500 IN Ring Gear | View on Amazon |
| VICTOR REINZ | 711482200 | 🇺🇸 US | 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.
4 Differential Cover Gasket parts are listed for the 1990 Avanti Ii, from FEL-PRO and VICTOR REINZ.
Listed part numbers: FEL-PRO RDS550281, FEL-PRO RDS55072 and VICTOR REINZ 711482400, plus the other parts above.
Differential Pinion Bearing / Race
Economy
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TIMKEN Popular | M802011 | 🇺🇸 US | Race | View on Amazon |
| TIMKEN Popular | M88048 | 🇺🇸 US | Rear OuterRC On | View on Amazon |
| TIMKEN Popular | M86649 | 🇺🇸 US | Rear OuterTo RC | View on Amazon |
| TIMKEN Popular | M802048 | 🇺🇸 US | Rear InnerRC On | View on Amazon |
| BCA | NBM86610 | 🇺🇸 US | Race | View on Amazon |
| BCA | NBM88010 | 🇺🇸 US | Race | View on Amazon |
| BCA | NBM802011 | 🇺🇸 US | Race | View on Amazon |
| BCA | NBM86649 | 🇺🇸 US | Bearing Shape: Cylindrical | View on Amazon |
| BCA | NBM88048 | 🇺🇸 US | Bearing Shape: Cylindrical | View on Amazon |
| BCA | NBHM89210 | 🇺🇸 US | Race | View on Amazon |
| BCA | NBM802048 | 🇺🇸 US | Bearing Shape: Cylindrical | View on Amazon |
| BCA | NBBR52 | 🇺🇸 US | Bearing & Race | View on Amazon |
| BCA | NBHM89249 | 🇺🇸 US | Rear Innerwith GMC Axle(s) | View on Amazon |
| NATIONAL | HM89249 | 🇺🇸 US | Rear Innerwith 7.5 IN Ring Gear | View on Amazon |
| TIMKEN | M86610 | 🇺🇸 US | Race | View on Amazon |
| TIMKEN | M88010 | 🇺🇸 US | Race | View on Amazon |
| TIMKEN | HM89210 | 🇺🇸 US | Race | View on Amazon |
| TIMKEN | HM89249 | 🇺🇸 US | Rear InnerTo RC | View on Amazon |
This table covers the bearings and races on the differential pinion.
32 Differential Pinion Bearing / Race parts for the 1990 Avanti Ii come from 6 brands — BCA, WJB / INMOTION PARTS, TIMKEN and 3 other brands. The "Popular" part is WJB / INMOTION PARTS WTM86649. Grades run from Economy through Standard Replacement; Standard Replacement is the most populated section, led by BCA, TIMKEN and NATIONAL.
Differential Pinion Repair Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BCA | NS99152 | 🇺🇸 US | Rear Outerwith GMC Axle(s) | View on Amazon |
| WJB / INMOTION PARTS | WS99152 | 🇺🇸 US | Rear Outerwith GMC Axle | View on Amazon |
| WJB / INMOTION PARTS | WS99193 | 🇺🇸 US | Rear Outerwith 8.5 IN Ring Gear | View on Amazon |
This table covers the wear sleeves used to restore a grooved pinion seal surface.
3 Differential Pinion Repair Sleeve parts are listed for the 1990 Avanti Ii, from WJB / INMOTION PARTS and BCA.
This group includes BCA NS99152, WJB / INMOTION PARTS WS99152 and WJB / INMOTION PARTS WS99193.
Differential Pinion Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NATIONAL Popular | 8610 | 🇺🇸 US | Rear Outerwith 7.5 IN Ring Gear | View on Amazon |
| TIMKEN Popular | 2043 | 🇺🇸 US | RearFrom RC | View on Amazon |
| BCA | NS2043 | 🇺🇸 US | Rear Outerwith GMC Axle(s) | View on Amazon |
| SCHAEFFLER | SS2983 | 🇺🇸 US | with 1.938 In Shaft | View on Amazon |
| TIMKEN | 8610 | 🇺🇸 US | RearTo RC | View on Amazon |
| WJB / INMOTION PARTS | WS2043 | 🇺🇸 US | Rear Outerwith 8.5 IN Ring Gear | View on Amazon |
| WJB / INMOTION PARTS | WS8610 | 🇺🇸 US | Rear Outerwith GMC Axle | 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.
7 Differential Pinion Seal parts are listed for the 1990 Avanti Ii, from TIMKEN, WJB / INMOTION PARTS, NATIONAL and 2 other brands. NATIONAL 8610 carries the "Popular" badge.
Listed part numbers: NATIONAL 8610, TIMKEN 2043 and BCA NS2043, plus the other parts above.
Differential Rebuild Kit
Master Kit
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TIMKEN Popular | DRK321MK | 🇺🇸 US | Master Kit | View on Amazon |
| MOTIVE GEAR | R10RMKT | 🇺🇸 US | with Timken Bearings | View on Amazon |
| WJB / INMOTION PARTS | WKRA320MK | 🇺🇸 US | Master Kit | View on Amazon |
Standard Kit
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TIMKEN Popular | DRK321 | 🇺🇸 US | Rear8.5" Ring Gear | View on Amazon |
| MOTIVE GEAR | R10R | 🇺🇸 US | Rear8.5" Ring Gear | View on Amazon |
| WJB / INMOTION PARTS | WKRA321 | 🇺🇸 US | Rearwith 8.5 IN Ring Gear | View on Amazon |
| WJB / INMOTION PARTS | WKRA320 | 🇺🇸 US | Rearwith GMC Axle | View on Amazon |
This table covers kits that group the bearings, races and seals for a differential rebuild.
7 Differential Rebuild Kit parts for the 1990 Avanti Ii come from 3 brands — WJB / INMOTION PARTS, TIMKEN and MOTIVE GEAR. The "Popular" part is TIMKEN DRK321MK.
The Master Kit section lists 3 options from TIMKEN, MOTIVE GEAR and WJB / INMOTION PARTS — grouped under the catalog's "Master Kit" designation — the notes column spells out what sets them apart. TIMKEN DRK321MK is listed in this group.
In the Standard Kit grade, WJB / INMOTION PARTS, TIMKEN and MOTIVE GEAR supply 4 parts: grouped under the catalog's "Standard Kit" designation — the notes column spells out what sets them apart. A representative part number is TIMKEN DRK321.
Part numbers include TIMKEN DRK321MK, MOTIVE GEAR R10RMKT and WJB / INMOTION PARTS WKRA320MK, among others listed above.
Buying Drivetrain Parts for a 1990 Avanti Ii
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 305cid 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 Carrier Bearing / Race .
Frequently Asked Questions
How many drivetrain parts fit the 1990 Avanti Ii?
Our catalog currently lists 65 drivetrain parts for the 1990 Avanti Ii across 7 subcategories and 12 brands, covering the 5.0L 305cid V8 engine. Each part is matched to the engine(s) it fits.
What are the signs of drivetrain problems on a 1990 Avanti Ii?
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 1990 Avanti Ii 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 1990 Avanti Ii?
Every part on this page is matched to the 5.0L 305cid 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 1990 Avanti Ii
Drivetrain Parts for Other Avanti Ii Years
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