34 Drivetrain parts are listed for the 1985 Avanti Ii, in 6 part types, covering the 5.0L 305cid V8 engine. Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 1985 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 (15 parts), Differential Carrier Bearing / Race (8 parts) and Differential Pinion Seal (5 parts). The other 3 part types cover the remaining 6 parts.
The 1985 Avanti Ii came with a single engine, the 5.0L 305cid V8, and every part is verified against it.
9 brands supply drivetrain parts for the 1985 Avanti Ii, led by WJB / INMOTION PARTS (8 parts), BCA (8 parts) and TIMKEN (7 parts), plus 6 more brands. Quality grades include Standard Replacement and Economy.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 1985 Avanti Ii. 6 parts have it, including NATIONAL 25523 (Differential Carrier Bearing / Race) and TIMKEN 02820 (Differential Pinion Bearing / Race). Each part number opens a page with every vehicle that part fits.
Differential Carrier Bearing / Race
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WJB / INMOTION PARTS | WT25523 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| WJB / INMOTION PARTS | WT25577 | 🇺🇸 US 🇨🇦 CA | Rearwith 8.5 IN Ring Gear | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NATIONAL Popular | 25523 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| TIMKEN Popular | 25523 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| BCA | NB25523 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| BCA | NB25577 | 🇺🇸 US 🇨🇦 CA | Rearwith Spicer 44 Axle(S) | View on Amazon |
| NATIONAL | 25577 | 🇺🇸 US 🇨🇦 CA | Rearwith 8.5 IN Ring Gear | View on Amazon |
| TIMKEN | 25577 | 🇺🇸 US 🇨🇦 CA | Rear | 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 1985 Avanti Ii, from WJB / INMOTION PARTS, NATIONAL, TIMKEN and 1 other brand. NATIONAL 25523 carries the "Popular" badge.
In the Economy grade, WJB / INMOTION PARTS supplies 2 parts: the catalog's value-priced group. A representative part number is WJB / INMOTION PARTS WT25523.
The Standard Replacement section lists 6 options from NATIONAL, TIMKEN and BCA — built to original-equipment specification. NATIONAL 25523 is listed in this group.
This group includes NATIONAL 25523, WJB / INMOTION PARTS WT25523 and WJB / INMOTION PARTS WT25577 and the remaining parts above.
Differential Cover Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO | RDS6629 | 🇺🇸 US 🇨🇦 CA | Rearwith Spicer 44 Axle(S) | View on Amazon |
| VICTOR REINZ | 711481100 | 🇺🇸 US 🇨🇦 CA | Rearwith Dana 44 Axle(S) | 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 1985 Avanti Ii, from FEL-PRO and VICTOR REINZ.
This group includes FEL-PRO RDS6629 and VICTOR REINZ 711481100.
Differential Pinion Bearing / Race
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WJB / INMOTION PARTS | WT02820 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| WJB / INMOTION PARTS | WT31520 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| WJB / INMOTION PARTS | WT02872 | 🇺🇸 US 🇨🇦 CA | Rear Outerwith 8.5 IN Ring Gear | View on Amazon |
| WJB / INMOTION PARTS | WT31594 | 🇺🇸 US 🇨🇦 CA | Rear Innerwith 8.5 IN Ring Gear | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TIMKEN Popular | 02820 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| TIMKEN Popular | 31520 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| TIMKEN Popular | 02872 | 🇺🇸 US 🇨🇦 CA | Rear Outer | View on Amazon |
| BCA | NB02820 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| BCA | NB31520 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| BCA | NB02872 | 🇺🇸 US 🇨🇦 CA | Rear Outerwith Spicer 44 Axle(S) | View on Amazon |
| BCA | NB31594 | 🇺🇸 US 🇨🇦 CA | Rear Innerwith Spicer 44 Axle(S) | View on Amazon |
| NATIONAL | 02820 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| NATIONAL | 02872 | 🇺🇸 US 🇨🇦 CA | Rear Outerwith 8.5 IN Ring Gear | View on Amazon |
| NATIONAL | 31594 | 🇺🇸 US 🇨🇦 CA | Rear Innerwith 8.5 IN Ring Gear | View on Amazon |
| TIMKEN | 31594 | 🇺🇸 US 🇨🇦 CA | Rear Inner | View on Amazon |
This table covers the bearings and races on the differential pinion.
15 Differential Pinion Bearing / Race parts for the 1985 Avanti Ii come from 4 brands — WJB / INMOTION PARTS, TIMKEN, BCA and 1 other brand. The "Popular" part is TIMKEN 02820.
The Economy section: 4 options from WJB / INMOTION PARTS. WJB / INMOTION PARTS WT02820 is listed in this group.
Standard Replacement: 11 parts, from TIMKEN, BCA and NATIONAL. A representative part number is TIMKEN 02820.
Differential Pinion Repair Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SCHAEFFLER | SR3481 | 🇺🇸 US 🇨🇦 CA | Rear14.3 mm Width | View on Amazon |
| WJB / INMOTION PARTS | WS99155 | 🇺🇸 US 🇨🇦 CA | Rear Outerwith 8.5 IN Ring Gear | 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 1985 Avanti Ii, from SCHAEFFLER and WJB / INMOTION PARTS.
Listed part numbers: SCHAEFFLER SR3481 and WJB / INMOTION PARTS WS99155.
Differential Pinion Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WJB / INMOTION PARTS Popular | WS5778 | 🇺🇸 US 🇨🇦 CA | Nitrile | View on Amazon |
| BCA | NS5778 | 🇺🇸 US 🇨🇦 CA | Nitrile | View on Amazon |
| BCA | NS5778V | 🇺🇸 US 🇨🇦 CA | Viton | View on Amazon |
| SCHAEFFLER | SS2633 | 🇺🇸 US 🇨🇦 CA | Rear16.891 mm Width | View on Amazon |
| TIMKEN | 5778 | 🇺🇸 US 🇨🇦 CA | Rear | 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.
5 Differential Pinion Seal parts are listed for the 1985 Avanti Ii, from BCA, WJB / INMOTION PARTS, SCHAEFFLER and 1 other brand. WJB / INMOTION PARTS WS5778 carries the "Popular" badge.
Part numbers include WJB / INMOTION PARTS WS5778, BCA NS5778 and BCA NS5778V, among others listed above.
Drive Shaft Center Support Bushing
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ATP | SB26 | 🇺🇸 US 🇨🇦 CA | 4 speed trans.Position: Center Support - Front | View on Amazon |
| PIONEER | 755074 | 🇺🇸 US 🇨🇦 CA | Rear4 speed trans. | View on Amazon |
This table covers the Drive Shaft Center Support bushings. Typical signs include a clunk over bumps, or a torn or walked-out bushing you can see. Press the new bushing square. A cocked bushing will tear in a few thousand miles.
2 Drive Shaft Center Support Bushing parts for the 1985 Avanti Ii come from 2 brands — ATP and PIONEER.
This group includes ATP SB26 and PIONEER 755074.
Buying Drivetrain Parts for a 1985 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 1985 Avanti Ii?
Our catalog currently lists 34 drivetrain parts for the 1985 Avanti Ii across 6 subcategories and 9 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 1985 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 1985 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 1985 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 1985 Avanti Ii
Drivetrain Parts for Other Avanti Ii Years
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