29 Drivetrain parts are listed for the 1966 MG MGB, in 5 part types, covering the 1.8L L4 engine. Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 1966 MG MGB, the drivetrain system moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware. 22 parts of the 29 listed are Differential Pinion Bearing / Race (11 parts), Universal Joint (6 parts) and Differential Pinion Seal (5 parts). The other 2 part types cover the remaining 7 parts.
The 1966 MG MGB came with a single engine, the 1.8L L4, and every part is verified against it.
9 brands supply drivetrain parts for the 1966 MG MGB, led by SCHAEFFLER (5 parts), TIMKEN (5 parts) and SKF (5 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 1966 MG MGB. 6 parts have it, including BCA NB15250X (Differential Pinion Bearing / Race) and WJB / INMOTION PARTS WS51098 (Differential Pinion Seal). Each part number opens a page with every vehicle that part fits.
Differential Carrier Bearing / Race
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SCHAEFFLER | LM603012 | 🇺🇸 US | Race | View on Amazon |
| SCHAEFFLER | KT36 | 🇺🇸 US | Rear1.781 In Inside Diameter X 3.063 In Outside Diameter X 0.844 In Thick | View on Amazon |
| SCHAEFFLER | KLM603049 | 🇺🇸 US | Bearing Only | View on Amazon |
| TIMKEN | SET36 | 🇺🇸 US | Tapered Roller Bearing | View on Amazon |
This table covers the bearings and races that support the differential carrier.
4 Differential Carrier Bearing / Race parts are listed for the 1966 MG MGB, from SCHAEFFLER and TIMKEN.
This group includes SCHAEFFLER LM603012, SCHAEFFLER KT36 and SCHAEFFLER KLM603049 and the remaining parts above.
Differential Pinion Bearing / Race
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FAMOUS BRAND | S15250X | 🇺🇸 US 🇨🇦 CA | RearOuter | View on Amazon |
| WJB / INMOTION PARTS | WT15250X | 🇺🇸 US | RaceOutside Diameter: 2.5 In | View on Amazon |
| WJB / INMOTION PARTS | WT15100 | 🇺🇸 US | Rear Outerwith British-Leyland Axle | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BCA Popular | NB15250X | 🇺🇸 US | Race Only | View on Amazon |
| TIMKEN Popular | 15250X | 🇺🇸 US | Race Only | View on Amazon |
| TIMKEN Popular | 3120 | 🇺🇸 US | Race Only | View on Amazon |
| BCA | NB15100 | 🇺🇸 US | Rear Outerwith British Leyland Axle(s) | View on Amazon |
| BCA | NB3120 | 🇺🇸 US | Race | View on Amazon |
| SCHAEFFLER | 15250X | 🇺🇸 US | Race Only | View on Amazon |
| SKF | 15250XVP | 🇺🇸 US | Race | View on Amazon |
| SKF | 3188S | 🇺🇸 US | with 1.250 In. Bearing Inside Diameter1.188" Width | View on Amazon |
This table covers the bearings and races on the differential pinion.
11 Differential Pinion Bearing / Race parts for the 1966 MG MGB come from 6 brands — BCA, WJB / INMOTION PARTS, TIMKEN and 3 other brands. The "Popular" part is BCA NB15250X.
The Economy section lists 3 options from WJB / INMOTION PARTS and FAMOUS BRAND — the catalog's value-priced group. FAMOUS BRAND S15250X is listed in this group.
In the Standard Replacement grade, BCA, TIMKEN, SKF and 1 other brand supply 8 parts: built to original-equipment specification. A representative part number is BCA NB15250X.
Differential Pinion Repair Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SCHAEFFLER | SR3477 | 🇺🇸 US | Rearwith 1.500 In Shaft | View on Amazon |
| SKF | 480151 | 🇺🇸 US | Rear | View on Amazon |
| WJB / INMOTION PARTS | WS99149 | 🇺🇸 US | Rear Outerwith British Leyland Axle | 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 1966 MG MGB, from SCHAEFFLER, SKF and WJB / INMOTION PARTS.
Part numbers include SCHAEFFLER SR3477, SKF 480151 and WJB / INMOTION PARTS WS99149.
Differential Pinion Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WJB / INMOTION PARTS Popular | WS51098 | 🇺🇸 US | Rear Outerwith British Leyland Axle | View on Amazon |
| BCA | NS51098 | 🇺🇸 US | Rear Outerwith British Leyland Axle(s) | View on Amazon |
| SKF | 15142 | 🇺🇸 US | Rear | View on Amazon |
| TIMKEN | 481837 | 🇺🇸 US | RearBanjo Type Differential | View on Amazon |
| TIMKEN | 224470 | 🇺🇸 US | RearTube Type Differential | 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 1966 MG MGB, from TIMKEN, WJB / INMOTION PARTS, BCA and 1 other brand. WJB / INMOTION PARTS WS51098 carries the "Popular" badge.
Listed part numbers: WJB / INMOTION PARTS WS51098, BCA NS51098 and SKF 15142, plus the other parts above.
Universal Joint
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DANA | 25101X | 🇺🇸 US | Spicer SelectNon-Greasable | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GMB Popular | 2200500 | 🇺🇸 US | GreasableGrease Fitting in Cross | View on Amazon |
| MOOG Popular | 341 | 🇺🇸 US | Fits Rear Driveshaft at Rear AxleExcept Short Grease Fitting | View on Amazon |
| DANA | 5101X | 🇺🇸 US | SpicerNon-Greasable | View on Amazon |
| GMB | 2200600 | 🇺🇸 US | GreasableGrease Fitting in Bearing Cap | View on Amazon |
| SKF | UJ341 | 🇺🇸 US | Greaseable | View on Amazon |
This table covers the U-joints in the driveshaft.
6 Universal Joint parts are listed for the 1966 MG MGB, from DANA, GMB, MOOG and 1 other brand. GMB 2200500 carries the "Popular" badge.
Economy: 1 part, from DANA. A representative part number is DANA 25101X.
The Standard Replacement section: 5 options from GMB, MOOG, DANA and 1 other brand. GMB 2200500 is listed in this group.
Part numbers include GMB 2200500, DANA 25101X and MOOG 341, among others listed above.
Buying Drivetrain Parts for a 1966 MG MGB
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 1.8L 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 MG MGB?
Our catalog currently lists 29 drivetrain parts for the 1966 MG MGB across 5 subcategories and 9 brands, covering the 1.8L L4 engine. Each part is matched to the engine(s) it fits.
What are the signs of drivetrain problems on a 1966 MG MGB?
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 MG MGB 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 MG MGB?
Every part on this page is matched to the 1.8L 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 MG MGB
Drivetrain Parts for Other MG MGB 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.