The 1973 Avanti Ii has 37 drivetrain parts with verified fitment on this page — 7 part types and 9 brands, covering the 6.6L 400cid V8 engine. Each part includes a manufacturer part number and application notes.
On the 1973 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 (11 parts), Universal Joint (8 parts) and Differential Carrier Bearing / Race (7 parts). The other 4 part types cover the remaining 11 parts.
Every part on this page is matched to the 6.6L 400cid V8 — the only engine offered in the 1973 Avanti Ii.
The most listed brands for 1973 Avanti Ii drivetrain parts are WJB / INMOTION PARTS (13 parts), BCA (8 parts) and NATIONAL (5 parts), plus 6 more brands. Quality grades include Standard Replacement, Economy and Heavy Duty.
8 parts on this 1973 Avanti Ii page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including NATIONAL 25523 (Differential Carrier Bearing / Race) and NATIONAL 02820 (Differential Pinion Bearing / Race). Click any part number to see 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 |
| NATIONAL Popular | 25577 | 🇺🇸 US 🇨🇦 CA | Rearwith 8.5 IN Ring Gear | View on Amazon |
| BCA | NB25523 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| BCA | NB25577 | 🇺🇸 US 🇨🇦 CA | Rearwith Spicer 44 Axle(S) | View on Amazon |
| SCHAEFFLER | K25577 | 🇺🇸 US 🇨🇦 CA | Rear25.4 mm Width | View on Amazon |
This table covers the bearings and races that support the differential carrier.
7 Differential Carrier Bearing / Race parts for the 1973 Avanti Ii come from 4 brands — WJB / INMOTION PARTS, NATIONAL, BCA and 1 other brand. The "Popular" part is NATIONAL 25523.
The Economy section lists 2 options from WJB / INMOTION PARTS — the catalog's value-priced group. WJB / INMOTION PARTS WT25523 is listed in this group.
In the Standard Replacement grade, NATIONAL, BCA and SCHAEFFLER supply 5 parts: built to original-equipment specification. A representative part number is NATIONAL 25523.
Listed part numbers: NATIONAL 25523, WJB / INMOTION PARTS WT25523 and WJB / INMOTION PARTS WT25577, plus the other 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 for the 1973 Avanti Ii come from 2 brands — FEL-PRO and VICTOR REINZ.
Part numbers include 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 |
|---|---|---|---|---|
| NATIONAL Popular | 02820 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| NATIONAL Popular | 02872 | 🇺🇸 US 🇨🇦 CA | Rear Outerwith 8.5 IN Ring Gear | View on Amazon |
| NATIONAL Popular | 31594 | 🇺🇸 US 🇨🇦 CA | Rear Innerwith 8.5 IN Ring Gear | 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 |
This table covers the bearings and races on the differential pinion.
11 Differential Pinion Bearing / Race parts are listed for the 1973 Avanti Ii, from WJB / INMOTION PARTS, BCA and NATIONAL. NATIONAL 02820 carries the "Popular" badge.
Economy: 4 parts, from WJB / INMOTION PARTS. A representative part number is WJB / INMOTION PARTS WT02820.
The Standard Replacement section: 7 options from BCA and NATIONAL. NATIONAL 02820 is listed in this group.
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 for the 1973 Avanti Ii come from 2 brands — SCHAEFFLER and WJB / INMOTION PARTS.
Part numbers include SCHAEFFLER SR3481 and WJB / INMOTION PARTS WS99155.
Differential Pinion Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SKF Popular | 15788 | 🇺🇸 US 🇨🇦 CA | Rear | 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 |
| WJB / INMOTION PARTS | WS5778 | 🇺🇸 US 🇨🇦 CA | Nitrile | 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 for the 1973 Avanti Ii come from 4 brands — BCA, SKF, SCHAEFFLER and 1 other brand. The "Popular" part is SKF 15788.
Part numbers include SKF 15788, BCA NS5778 and BCA NS5778V, among others listed above.
Universal Joint
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WJB / INMOTION PARTS | UJT269 | 🇺🇸 US 🇨🇦 CA | Grade Type: Performance-Non-Greaseable | View on Amazon |
| WJB / INMOTION PARTS | UJT369 | 🇺🇸 US 🇨🇦 CA | Grade Type: STD-Greaseable | View on Amazon |
| WJB / INMOTION PARTS | UJT280 | 🇺🇸 US 🇨🇦 CA | Grade Type: Performance-Bearing Greaseable | View on Amazon |
Heavy Duty
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOOG Popular | 269 | 🇺🇸 US 🇨🇦 CA | Super StrengthNon-Greasable | View on Amazon |
| GMB | 2150153 | 🇺🇸 US 🇨🇦 CA | PerformanceGreasable | View on Amazon |
| MOOG | 280 | 🇺🇸 US 🇨🇦 CA | Super StrengthGreasable | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| MOOG Popular | 369 | 🇺🇸 US 🇨🇦 CA | Greasable | View on Amazon |
| GMB | 2100153 | 🇺🇸 US 🇨🇦 CA | GreasableGrease Fitting in Cross | View on Amazon |
This table covers the U-joints in the driveshaft.
8 Universal Joint parts for the 1973 Avanti Ii come from 3 brands — WJB / INMOTION PARTS, MOOG and GMB. The "Popular" part is MOOG 269.
The Economy section: 3 options from WJB / INMOTION PARTS. WJB / INMOTION PARTS UJT269 is listed in this group.
In the Heavy Duty grade, MOOG and GMB supply 3 parts: rated for severe service. A representative part number is MOOG 269.
Standard Replacement: 2 parts, from MOOG and GMB. A representative part number is MOOG 369.
Listed part numbers: MOOG 269, WJB / INMOTION PARTS UJT269 and WJB / INMOTION PARTS UJT369, plus the other parts above.
Universal Joint Strap Kit
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WJB / INMOTION PARTS | UJT43710 | 🇺🇸 US 🇨🇦 CA | Rear Shaft All Joints1/4-28 Bolts | View on Amazon |
| WJB / INMOTION PARTS | UJT36010 | 🇺🇸 US 🇨🇦 CA | Rear Shaft All Joints5/16-24 Bolts | View on Amazon |
This table covers the Universal Joint Strap kits.
2 Universal Joint Strap Kit parts for the 1973 Avanti Ii come from WJB / INMOTION PARTS.
Part numbers include WJB / INMOTION PARTS UJT43710 and WJB / INMOTION PARTS UJT36010.
Buying Drivetrain Parts for a 1973 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 6.6L 400cid 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 Universal Joint .
Frequently Asked Questions
How many drivetrain parts fit the 1973 Avanti Ii?
Our catalog currently lists 37 drivetrain parts for the 1973 Avanti Ii across 7 subcategories and 9 brands, covering the 6.6L 400cid V8 engine. Each part is matched to the engine(s) it fits.
What are the signs of drivetrain problems on a 1973 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 1973 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 1973 Avanti Ii?
Every part on this page is matched to the 6.6L 400cid 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 1973 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.