29 Drivetrain parts are listed for the 1966 Triumph TR4A, in 5 part types, covering the 2.1L L4 engine. Each one has a brand, a manufacturer part number and notes that say where it fits.
The drivetrain system on the 1966 Triumph TR4A moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware. The largest groups are Differential Pinion Bearing / Race (12 parts), Universal Joint (6 parts) and Differential Carrier Bearing / Race (5 parts). The other 2 part types cover the remaining 6 parts.
The 1966 Triumph TR4A came with a single engine, the 2.1L L4, and every part is verified against it.
10 brands supply drivetrain parts for the 1966 Triumph TR4A, led by TIMKEN (7 parts), BCA (5 parts) and WJB / INMOTION PARTS (4 parts), plus 7 more brands. Quality grades include Standard Replacement and Economy.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 1966 Triumph TR4A. 6 parts have it, including TIMKEN 16150 (Differential Carrier Bearing / Race) and WJB / INMOTION PARTS WT15245 (Differential Pinion Bearing / Race). Each part number opens a page with every vehicle that part fits.
Differential Carrier Bearing / Race
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TIMKEN Popular | 16150 | 🇺🇸 US | Rear | View on Amazon |
| BCA | NB16283 | 🇺🇸 US | Race | View on Amazon |
| BCA | NB16150 | 🇺🇸 US | Rearwith Standard CTC Axle | View on Amazon |
| SKF | BR16283 | 🇺🇸 US | Race | View on Amazon |
| TIMKEN | 16283 | 🇺🇸 US | Race | View on Amazon |
This table covers the bearings and races that support the differential carrier.
5 Differential Carrier Bearing / Race parts are listed for the 1966 Triumph TR4A, from TIMKEN, BCA and SKF. TIMKEN 16150 carries the "Popular" badge.
This group includes TIMKEN 16150, BCA NB16283 and BCA NB16150 and the remaining parts above.
Differential Pinion Bearing / Race
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WJB / INMOTION PARTS Popular | WT15245 | 🇺🇸 US | Race | View on Amazon |
| WJB / INMOTION PARTS | WT15100 | 🇺🇸 US | Rear Outerwith Standard CTC Axle | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Popular | AC15245 | 🇺🇸 US 🇨🇦 CA | GoldRace Only | View on Amazon |
| TIMKEN Popular | 15245 | 🇺🇸 US | Race Only | View on Amazon |
| BCA | NB15245 | 🇺🇸 US | Race Only | View on Amazon |
| BCA | NB15100 | 🇺🇸 US | Rear Outerwith Standard CTC Axle | View on Amazon |
| BCA | NB3120 | 🇺🇸 US | Race | View on Amazon |
| SCHAEFFLER | K3188 | 🇺🇸 US | Rear Inner | View on Amazon |
| SCHAEFFLER | K15100 | 🇺🇸 US | Rear Outer20.638 mm Width | View on Amazon |
| TIMKEN | 15100 | 🇺🇸 US | Rear Outer | View on Amazon |
| TIMKEN | 3120 | 🇺🇸 US | Race Only | View on Amazon |
| TIMKEN | 3188 | 🇺🇸 US | Rear Inner | View on Amazon |
This table covers the bearings and races on the differential pinion.
12 Differential Pinion Bearing / Race parts for the 1966 Triumph TR4A come from 5 brands — TIMKEN, BCA, WJB / INMOTION PARTS and 2 other brands. The "Popular" part is WJB / INMOTION PARTS WT15245.
The Economy section lists 2 options from WJB / INMOTION PARTS — the catalog's value-priced group. WJB / INMOTION PARTS WT15245 is listed in this group.
In the Standard Replacement grade, TIMKEN, BCA, SCHAEFFLER and 1 other brand supply 10 parts: built to original-equipment specification. A representative part number is ACDELCO AC15245.
Differential Pinion Repair Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SCHAEFFLER | SR3477 | 🇺🇸 US | Rearwith 1.500 In Shaft | View on Amazon |
| WJB / INMOTION PARTS | WS99149 | 🇺🇸 US | Rear Outerwith Standard CTC 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 1966 Triumph TR4A, from SCHAEFFLER and WJB / INMOTION PARTS.
Part numbers include SCHAEFFLER SR3477 and WJB / INMOTION PARTS WS99149.
Differential Pinion Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SCHAEFFLER | SS2582 | 🇺🇸 US | Rear2.69" O.D. X 0.5" Width | View on Amazon |
| SKF | 15207 | 🇺🇸 US | Rear | View on Amazon |
| TIMKEN | 470487N | 🇺🇸 US | Rear | View on Amazon |
| WJB / INMOTION PARTS | WS470487N | 🇺🇸 US | Rear Outerwith Standard CTC 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 1966 Triumph TR4A, from SCHAEFFLER, SKF, TIMKEN and 1 other brand.
Listed part numbers: SCHAEFFLER SS2582, SKF 15207 and TIMKEN 470487N, plus the other parts above.
Universal Joint
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DANA | 253214X | 🇺🇸 US | Spicer SelectGreasable | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GMB Popular | 2201100 | 🇺🇸 US | GreasableGrease Fitting in Cross | View on Amazon |
| MOOG Popular | 344 | 🇺🇸 US | Fits Rear Driveshaft at Rear Axle | View on Amazon |
| DANA | 53214X | 🇺🇸 US | SpicerGreasable | View on Amazon |
| FVP | 2201100 | 🇺🇸 US | GreasableGrease Fitting in Cross | View on Amazon |
| SKF | UJ344 | 🇺🇸 US | Greaseable | View on Amazon |
This table covers the U-joints in the driveshaft.
6 Universal Joint parts are listed for the 1966 Triumph TR4A, from DANA, GMB, MOOG and 2 other brands. GMB 2201100 carries the "Popular" badge.
Economy: 1 part, from DANA. A representative part number is DANA 253214X.
The Standard Replacement section: 5 options from GMB, MOOG, DANA and 2 other brands. GMB 2201100 is listed in this group.
Listed part numbers: GMB 2201100, DANA 253214X and MOOG 344, plus the other parts above.
Buying Drivetrain Parts for a 1966 Triumph TR4A
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 2.1L L4 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 1966 Triumph TR4A?
Our catalog currently lists 29 drivetrain parts for the 1966 Triumph TR4A across 5 subcategories and 10 brands, covering the 2.1L L4 engine. Each part is matched to the engine(s) it fits.
What are the signs of drivetrain problems on a 1966 Triumph TR4A?
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 1966 Triumph TR4A 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 1966 Triumph TR4A?
Every part on this page is matched to the 2.1L L4 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 1966 Triumph TR4A
Drivetrain Parts for Other Triumph TR4A Years
Switch vehicle or jump to a subcategory
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.