The 1987 Avanti Ii has 38 drivetrain parts with verified fitment on this page — 7 part types and 10 brands, covering the 5.0L 305cid V8 engine. Each part includes a manufacturer part number and application notes.
On the 1987 Avanti Ii, the drivetrain system moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware. Most of the listed parts are Differential Pinion Bearing / Race (16 parts), Differential Carrier Bearing / Race (7 parts) and Axle Shaft Bearing (4 parts). The other 4 part types cover the remaining 11 parts.
The 1987 Avanti Ii came with a single engine, the 5.0L 305cid V8, and every part is verified against it.
10 brands supply drivetrain parts for the 1987 Avanti Ii, led by WJB / INMOTION PARTS (10 parts), BCA (9 parts) and TIMKEN (7 parts), plus 7 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 1987 Avanti Ii. 6 parts have it, including TIMKEN 25523 (Differential Carrier Bearing / Race) and WJB / INMOTION PARTS WTM86610 (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 1987 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.
Listed part numbers: MEVOTECH HRP5707, ACDELCO 5707 and BCA NBRP5707, plus the other 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 | Rearwith GMC Axle | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TIMKEN Popular | 25523 | 🇺🇸 US | Race | View on Amazon |
| TIMKEN Popular | 25577 | 🇺🇸 US | Rear | View on Amazon |
| ACDELCO | LM501349 | 🇺🇸 US 🇨🇦 CA | Gold | View on Amazon |
| BCA | NBLM501314 | 🇺🇸 US | Race | View on Amazon |
| BCA | NBLM501349 | 🇺🇸 US | Rearwith GMC Axle(s) | View on Amazon |
This table covers the bearings and races that support the differential carrier.
7 Differential Carrier Bearing / Race parts are listed for the 1987 Avanti Ii, from WJB / INMOTION PARTS, TIMKEN, BCA and 1 other brand. TIMKEN 25523 carries the "Popular" badge.
Economy: 2 parts, from WJB / INMOTION PARTS. A representative part number is WJB / INMOTION PARTS WTLM501314.
The Standard Replacement section: 5 options from TIMKEN, BCA and ACDELCO. TIMKEN 25523 is listed in this group.
Listed part numbers: TIMKEN 25523, WJB / INMOTION PARTS WTLM501314 and WJB / INMOTION PARTS WTLM501349, plus the other parts above.
Differential Cover Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| 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 |
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.
2 Differential Cover Gasket parts are listed for the 1987 Avanti Ii, from FEL-PRO and VICTOR REINZ.
This group includes FEL-PRO RDS55072 and VICTOR REINZ 711482400.
Differential Pinion Bearing / Race
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WJB / INMOTION PARTS Popular | WTM86610 | 🇺🇸 US | RaceCup Outside Diameter (In): 2.5310000000000001 In | View on Amazon |
| WJB / INMOTION PARTS Popular | WTM86649 | 🇺🇸 US | Rear Outerwith GMC Axle | View on Amazon |
| FAMOUS BRAND | SM86610 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| FAMOUS BRAND | SM88010 | 🇺🇸 US 🇨🇦 CA | RearOUTER | View on Amazon |
| WJB / INMOTION PARTS | WTHM89210 | 🇺🇸 US | Race | View on Amazon |
| WJB / INMOTION PARTS | WTHM89249 | 🇺🇸 US | Rear Innerwith GMC Axle | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TIMKEN Popular | M86610 | 🇺🇸 US | Race | View on Amazon |
| TIMKEN Popular | M86649 | 🇺🇸 US | Rear Outer | View on Amazon |
| ACDELCO | M86610X | 🇺🇸 US 🇨🇦 CA | GoldRace | View on Amazon |
| BCA | NBM86610 | 🇺🇸 US | Race | View on Amazon |
| BCA | NBM86649 | 🇺🇸 US | Bearing Shape: Cylindrical | View on Amazon |
| BCA | NBHM89210 | 🇺🇸 US | 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 | HM89210 | 🇺🇸 US | Race | View on Amazon |
| TIMKEN | HM89249 | 🇺🇸 US | Rear Inner | View on Amazon |
This table covers the bearings and races on the differential pinion.
16 Differential Pinion Bearing / Race parts for the 1987 Avanti Ii come from 6 brands — WJB / INMOTION PARTS, TIMKEN, BCA and 3 other brands. The "Popular" part is WJB / INMOTION PARTS WTM86610.
The Economy section: 6 options from WJB / INMOTION PARTS and FAMOUS BRAND. WJB / INMOTION PARTS WTM86610 is listed in this group.
Standard Replacement: 10 parts, from TIMKEN, BCA, ACDELCO and 1 other brand. A representative part number is TIMKEN M86610.
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 |
This table covers the wear sleeves used to restore a grooved pinion seal surface.
2 Differential Pinion Repair Sleeve parts are listed for the 1987 Avanti Ii, from BCA and WJB / INMOTION PARTS.
This group includes BCA NS99152 and WJB / INMOTION PARTS WS99152.
Differential Pinion Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BCA | NS8610 | 🇺🇸 US | Rear Outerwith GMC Axle(s) | View on Amazon |
| NATIONAL | 8610 | 🇺🇸 US | Rear Outerwith 7.5 IN Ring Gear | View on Amazon |
| TIMKEN | 8610 | 🇺🇸 US | Rear | 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.
4 Differential Pinion Seal parts are listed for the 1987 Avanti Ii, from BCA, NATIONAL, TIMKEN and 1 other brand.
Listed part numbers: BCA NS8610 and NATIONAL 8610, plus the other parts above.
Differential Rebuild Kit
Master Kit
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WJB / INMOTION PARTS | WKRA320MK | 🇺🇸 US | Master Kit | View on Amazon |
Standard Kit
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NATIONAL | RA320 | 🇺🇸 US | RearStandard | 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.
3 Differential Rebuild Kit parts for the 1987 Avanti Ii come from 2 brands — WJB / INMOTION PARTS and NATIONAL.
The Master Kit section lists 1 option from WJB / INMOTION PARTS — grouped under the catalog's "Master Kit" designation — the notes column spells out what sets them apart. WJB / INMOTION PARTS WKRA320MK is listed in this group.
In the Standard Kit grade, NATIONAL and WJB / INMOTION PARTS supply 2 parts: grouped under the catalog's "Standard Kit" designation — the notes column spells out what sets them apart. A representative part number is NATIONAL RA320.
This group includes WJB / INMOTION PARTS WKRA320MK, NATIONAL RA320 and WJB / INMOTION PARTS WKRA320.
Buying Drivetrain Parts for a 1987 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 1987 Avanti Ii?
Our catalog currently lists 38 drivetrain parts for the 1987 Avanti Ii across 7 subcategories and 10 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 1987 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 1987 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 1987 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 1987 Avanti Ii
Drivetrain Parts for Other Avanti Ii Years
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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.