The 1958 MG Mga has 15 drivetrain parts with verified fitment on this page — 4 part types and 7 brands, covering both the 1.5L L4 and the 1.6L L4. Each part includes a manufacturer part number and application notes.
On the 1958 MG Mga, the drivetrain system moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware. 13 parts of the 15 listed are Universal Joint (6 parts), Differential Pinion Bearing / Race (5 parts) and Differential Pinion Repair Sleeve (2 parts). The other 1 part type covers the remaining 2 parts.
The 1958 MG Mga was sold with both the 1.5L L4 and the 1.6L L4. All 15 parts on this page fit every engine.
7 brands supply drivetrain parts for the 1958 MG Mga, led by WJB / INMOTION PARTS (4 parts), BCA (4 parts) and DANA (2 parts), plus 4 more brands. Quality grades include Standard Replacement and Economy.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 1958 MG Mga. 3 parts have it, including BCA NB15250X (Differential Pinion Bearing / Race) and GMB 2200500 (Universal Joint). Each part number opens a page with every vehicle that part fits.
Differential Pinion Bearing / Race
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WJB / INMOTION PARTS Fits: all 1958 Mga engines | WT15250X | 🇺🇸 US | RaceOutside Diameter: 2.5 In | View on Amazon |
| WJB / INMOTION PARTS Fits: all 1958 Mga engines | WT15100 | 🇺🇸 US | Rear Outerwith British-Leyland Axle | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BCA Popular Fits: all 1958 Mga engines | NB15250X | 🇺🇸 US | Race Only | View on Amazon |
| BCA Fits: all 1958 Mga engines | NB15100 | 🇺🇸 US | Rear Outerwith British Leyland Axle(s) | View on Amazon |
| BCA Fits: all 1958 Mga engines | NB3120 | 🇺🇸 US | Race | View on Amazon |
This table covers the bearings and races on the differential pinion.
5 Differential Pinion Bearing / Race parts for the 1958 MG Mga come from 2 brands — BCA and WJB / INMOTION PARTS. The "Popular" part is BCA NB15250X. Every part fits both the 1.5L L4 and the 1.6L L4.
The Economy section lists 2 options from WJB / INMOTION PARTS — the catalog's value-priced group. WJB / INMOTION PARTS WT15250X is listed in this group.
In the Standard Replacement grade, BCA supplies 3 parts: built to original-equipment specification. A representative part number is BCA NB15250X.
Listed part numbers: BCA NB15250X, WJB / INMOTION PARTS WT15250X and WJB / INMOTION PARTS WT15100, plus the other parts above.
Differential Pinion Repair Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SCHAEFFLER Fits: all 1958 Mga engines | SR3477 | 🇺🇸 US | Rearwith 1.500 In Shaft | View on Amazon |
| WJB / INMOTION PARTS Fits: all 1958 Mga engines | WS99149 | 🇺🇸 US | Rear Outerwith British Leyland 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 1958 MG Mga, from SCHAEFFLER and WJB / INMOTION PARTS. All of them fit every engine offered in the 1958 Mga.
Listed part numbers: SCHAEFFLER SR3477 and WJB / INMOTION PARTS WS99149.
Differential Pinion Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BCA Fits: all 1958 Mga engines | NS51098 | 🇺🇸 US | Rear Outerwith British Leyland Axle(s) | View on Amazon |
| WJB / INMOTION PARTS Fits: all 1958 Mga engines | WS51098 | 🇺🇸 US | Rear Outerwith British Leyland 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.
2 Differential Pinion Seal parts are listed for the 1958 MG Mga, from BCA and WJB / INMOTION PARTS. All of them fit every engine offered in the 1958 Mga.
Listed part numbers: BCA NS51098 and WJB / INMOTION PARTS WS51098.
Universal Joint
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DANA Fits: all 1958 Mga engines | 25101X | 🇺🇸 US | Spicer SelectNon-Greasable | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GMB Popular Fits: all 1958 Mga engines | 2200500 | 🇺🇸 US | GreasableGrease Fitting in Cross | View on Amazon |
| MOOG Popular Fits: all 1958 Mga engines | 341 | 🇺🇸 US | Fits Rear Driveshaft at Rear AxleExcept Short Grease Fitting | View on Amazon |
| DANA Fits: all 1958 Mga engines | 5101X | 🇺🇸 US | SpicerNon-Greasable | View on Amazon |
| GMB Fits: all 1958 Mga engines | 2200600 | 🇺🇸 US | GreasableGrease Fitting in Bearing Cap | View on Amazon |
| SKF Fits: all 1958 Mga engines | UJ341 | 🇺🇸 US | Greaseable | View on Amazon |
This table covers the U-joints in the driveshaft.
6 Universal Joint parts are listed for the 1958 MG Mga, from DANA, GMB, MOOG and 1 other brand. GMB 2200500 carries the "Popular" badge. All of them fit every engine offered in the 1958 Mga.
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.
This group includes GMB 2200500, DANA 25101X and MOOG 341 and the remaining parts above.
Buying Drivetrain Parts for a 1958 MG Mga
On this vehicle, the drivetrain system moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware.
- You do not need to pick an engine: every drivetrain part on this page fits both the 1.5L L4 and the 1.6L L4.
- 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: Universal Joint and Differential Pinion Bearing / Race .
Frequently Asked Questions
How many drivetrain parts fit the 1958 MG Mga?
Our catalog currently lists 15 drivetrain parts for the 1958 MG Mga across 4 subcategories and 7 brands, covering both the 1.5L L4 and the 1.6L L4. Each part is matched to the engine(s) it fits.
Do drivetrain parts differ between 1958 MG Mga engines?
No. On this page every drivetrain part fits both the 1.5L L4 and the 1.6L L4. You do not need to pick an engine to choose the right row — use the notes for position and trim.
What are the signs of drivetrain problems on a 1958 MG Mga?
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 1958 MG Mga 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 1958 MG Mga?
Every part on this page already fits both the 1.5L L4 and the 1.6L L4. 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 1958 MG Mga
Drivetrain Parts for Other MG Mga Years
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