The 1973 MG MGB has 41 drivetrain parts with verified fitment on this page — 4 part types and 12 brands, covering both the 1.8L L4 and the 3.5L V8. Each part includes a manufacturer part number and application notes.
The drivetrain system on the 1973 MG MGB moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware. The largest groups are Differential Pinion Bearing / Race (20 parts), Differential Carrier Bearing / Race (12 parts) and Universal Joint (6 parts). The other 1 part type covers the remaining 3 parts.
The 1973 MG MGB was sold with both the 1.8L L4 and the 3.5L V8. 38 parts fit every engine; the other 3 are engine-specific. Each part shows which engine(s) it fits.
12 brands supply drivetrain parts for the 1973 MG MGB, led by TIMKEN (7 parts), SKF (7 parts) and WJB / INMOTION PARTS (6 parts), plus 9 more brands. Quality grades include Standard Replacement and Economy.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 1973 MG MGB. 9 parts have it, including WJB / INMOTION PARTS WTA36 (Differential Carrier Bearing / Race) and WJB / INMOTION PARTS WTM88048 (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 Popular Fits: all 1973 MGB engines | WTA36 | 🇺🇸 US 🇨🇦 CA | Rearwith British Leyland Axle | View on Amazon |
| WJB / INMOTION PARTS Fits: all 1973 MGB engines | WTLM603012 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Popular Fits: all 1973 MGB engines | A36 | 🇺🇸 US 🇨🇦 CA | GoldSet | View on Amazon |
| TIMKEN Popular Fits: all 1973 MGB engines | SET36 | 🇺🇸 US 🇨🇦 CA | Tapered Roller Bearing | View on Amazon |
| BCA Fits: all 1973 MGB engines | NBA36 | 🇺🇸 US 🇨🇦 CA | Taper Bearing SetIncludes Cup and Cone | View on Amazon |
| NSK Fits: all 1973 MGB engines | TRB36 | 🇺🇸 US 🇨🇦 CA | Kit Contents: 1 Cup, 1 ConeBearing and Race Set | View on Amazon |
| SCHAEFFLER Fits: all 1973 MGB engines | LM603012 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| SCHAEFFLER Fits: all 1973 MGB engines | KT36 | 🇺🇸 US 🇨🇦 CA | Rear1.781 In Inside Diameter X 3.063 In Outside Diameter X 0.844 In Thick | View on Amazon |
| SCHAEFFLER Fits: all 1973 MGB engines | KLM603049 | 🇺🇸 US 🇨🇦 CA | Bearing Only | View on Amazon |
| SKF Fits: all 1973 MGB engines | LM603012 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| SKF Fits: all 1973 MGB engines | LM603049VP | 🇺🇸 US 🇨🇦 CA | with 1.7810 In. Bearing Inside Diameter | View on Amazon |
| SKF Fits: all 1973 MGB engines | BR36 | 🇺🇸 US 🇨🇦 CA | Rear | View on Amazon |
This table covers the bearings and races that support the differential carrier.
12 Differential Carrier Bearing / Race parts are listed for the 1973 MG MGB, from SCHAEFFLER, SKF, WJB / INMOTION PARTS and 4 other brands. WJB / INMOTION PARTS WTA36 carries the "Popular" badge. All of them fit every engine offered in the 1973 MGB.
In the Economy grade, WJB / INMOTION PARTS supplies 2 parts: the catalog's value-priced group. A representative part number is WJB / INMOTION PARTS WTA36.
The Standard Replacement section lists 10 options from SCHAEFFLER, SKF, ACDELCO and 3 other brands — built to original-equipment specification. ACDELCO A36 is listed in this group.
Differential Pinion Bearing / Race
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WJB / INMOTION PARTS Popular Fits: all 1973 MGB engines | WTM88048 | 🇺🇸 US 🇨🇦 CA | Bearing Shape: Cylindrical | View on Amazon |
| FAMOUS BRAND Fits: 1.8L L4 | SM88010 | 🇺🇸 US 🇨🇦 CA | RearOUTER | View on Amazon |
| ULTRA-POWER Fits: 1.8L L4 | WTM88048 | 🇺🇸 US 🇨🇦 CA | RearOuter | View on Amazon |
| WJB / INMOTION PARTS Fits: all 1973 MGB engines | WTM88010 | 🇺🇸 US 🇨🇦 CA | RaceCup Outside Diameter (In): 2.6880000000000002 In | View on Amazon |
| WJB / INMOTION PARTS Fits: all 1973 MGB engines | WTHM801346X | 🇺🇸 US 🇨🇦 CA | Width: 1.125 In | View on Amazon |
| WJB / INMOTION PARTS Fits: all 1973 MGB engines | WTHM801310 | 🇺🇸 US 🇨🇦 CA | RaceWidth: 0.90600000000000003 In | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SKF Popular Fits: all 1973 MGB engines | BR52 | 🇺🇸 US 🇨🇦 CA | Rear Outer | View on Amazon |
| TIMKEN Popular Fits: all 1973 MGB engines | M88010 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| TIMKEN Popular Fits: all 1973 MGB engines | M88048 | 🇺🇸 US 🇨🇦 CA | Fits Rear OuterBanjo Type Differential | View on Amazon |
| BCA Fits: all 1973 MGB engines | NBM88010 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| BCA Fits: all 1973 MGB engines | NBM88048 | 🇺🇸 US 🇨🇦 CA | Bearing Shape: Cylindrical | View on Amazon |
| BCA Fits: all 1973 MGB engines | NBHM801310 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| BCA Fits: all 1973 MGB engines | NBBR52 | 🇺🇸 US 🇨🇦 CA | Bearing & Race | View on Amazon |
| BCA Fits: all 1973 MGB engines | NBHM801346X | 🇺🇸 US 🇨🇦 CA | Bearing Shape: Cylindrical | View on Amazon |
| SCHAEFFLER Fits: all 1973 MGB engines | M88010 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| SCHAEFFLER Fits: all 1973 MGB engines | KT63 | 🇺🇸 US 🇨🇦 CA | Front Outer | View on Amazon |
| SCHAEFFLER Fits: all 1973 MGB engines | KM88048 | 🇺🇸 US 🇨🇦 CA | Rear Outer1.313 In Inside Diameter X 2.688 In Outside Diameter X 0.875 In Thick | View on Amazon |
| SKF Fits: all 1973 MGB engines | M88010VP | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| TIMKEN Fits: all 1973 MGB engines | HM801310 | 🇺🇸 US 🇨🇦 CA | Race | View on Amazon |
| TIMKEN Fits: all 1973 MGB engines | HM801346X | 🇺🇸 US 🇨🇦 CA | Fits Rear InnerBanjo Type Differential | View on Amazon |
This table covers the bearings and races on the differential pinion.
20 Differential Pinion Bearing / Race parts for the 1973 MG MGB come from 7 brands — BCA, WJB / INMOTION PARTS, TIMKEN and 4 other brands. The "Popular" part is WJB / INMOTION PARTS WTM88048. 18 parts fit every engine; the other 2 are engine-specific.
The Economy section: 6 options from WJB / INMOTION PARTS, FAMOUS BRAND and ULTRA-POWER. WJB / INMOTION PARTS WTM88048 is listed in this group.
Standard Replacement: 14 parts, from BCA, TIMKEN, SCHAEFFLER and 1 other brand. A representative part number is SKF BR52.
Differential Pinion Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SKF Fits: all 1973 MGB engines | 17184 | 🇺🇸 US 🇨🇦 CA | Rear | View on Amazon |
| TIMKEN Fits: all 1973 MGB engines | 481837 | 🇺🇸 US 🇨🇦 CA | RearBanjo Type Differential | View on Amazon |
| TIMKEN Fits: all 1973 MGB engines | 224470 | 🇺🇸 US 🇨🇦 CA | 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.
3 Differential Pinion Seal parts are listed for the 1973 MG MGB, from TIMKEN and SKF. All of them fit every engine offered in the 1973 MGB.
Listed part numbers: SKF 17184, TIMKEN 481837 and TIMKEN 224470.
Universal Joint
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DANA Fits: all 1973 MGB engines | 25101X | 🇺🇸 US 🇨🇦 CA | Spicer SelectNon-Greasable | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GMB Popular Fits: all 1973 MGB engines | 2200500 | 🇺🇸 US 🇨🇦 CA | GreasableGrease Fitting in Cross | View on Amazon |
| MOOG Popular Fits: 1.8L L4 | 341 | 🇺🇸 US 🇨🇦 CA | Fits Rear Driveshaft at Rear AxleExcept Short Grease Fitting | View on Amazon |
| DANA Fits: all 1973 MGB engines | 5101X | 🇺🇸 US 🇨🇦 CA | SpicerNon-Greasable | View on Amazon |
| GMB Fits: all 1973 MGB engines | 2200600 | 🇺🇸 US 🇨🇦 CA | GreasableGrease Fitting in Bearing Cap | View on Amazon |
| SKF Fits: all 1973 MGB engines | UJ341 | 🇺🇸 US 🇨🇦 CA | Greaseable | View on Amazon |
This table covers the U-joints in the driveshaft.
6 Universal Joint parts are listed for the 1973 MG MGB, from DANA, GMB, MOOG and 1 other brand. GMB 2200500 carries the "Popular" badge. 5 parts fit every engine; the other 1 is engine-specific.
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.
Listed part numbers: GMB 2200500, DANA 25101X and MOOG 341, plus the other parts above.
Buying Drivetrain Parts for a 1973 MG MGB
On this vehicle, the drivetrain system moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware.
- Match the engine first. Some drivetrain parts fit every engine; others are engine-specific. Each row shows which engine(s) it fits.
- 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 1973 MG MGB?
Our catalog currently lists 41 drivetrain parts for the 1973 MG MGB across 4 subcategories and 12 brands, covering both the 1.8L L4 and the 3.5L V8. Each part is matched to the engine(s) it fits.
Do drivetrain parts differ between 1973 MG MGB engines?
Some do. 38 parts fit every engine; the other 3 are engine-specific. Each row (and the filter at the top) shows which. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of drivetrain problems on a 1973 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 1973 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 1973 MG MGB?
First match the engine — each row shows which engine(s) the part fits. 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 MG MGB
Drivetrain Parts for Other MG MGB Years
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