11 Automatic transmission parts are listed for the 1977 MG MGB, in 8 part types, covering both the 1.8L L4 and the 3.5L V8. Each one has a brand, a manufacturer part number and notes that say where it fits.
The automatic transmission on the 1977 MG MGB covers the automatic gearbox and its supporting cast — filters, coolers, solenoids, mounts and torque-converter parts. The largest groups are Transmission Fluid (3 parts), Extension Housing Seal (2 parts) and Filter (1 part). The other 5 part types cover the remaining 5 parts.
The 1977 MG MGB was sold with both the 1.8L L4 and the 3.5L V8. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
6 brands supply automatic transmission parts for the 1977 MG MGB, led by ATP (3 parts), VALVOLINE (3 parts) and WJB / INMOTION PARTS (2 parts), plus 3 more brands.
Each part number listed for the 1977 MG MGB opens a page with every vehicle that part fits.
Extension Housing Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ATP Fits: 1.8L L4 | KO3 | 🇺🇸 US 🇨🇦 CA | Outer Diameter: 2.25" | View on Amazon |
| PIONEER Fits: 1.8L L4 | 759045 | 🇺🇸 US 🇨🇦 CA | Outer Diameter: 2.25" | View on Amazon |
This table covers the seals at the Extension Housing. 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 Extension Housing Seal parts for the 1977 MG MGB come from 2 brands — ATP and PIONEER.
Part numbers include ATP KO3 and PIONEER 759045.
Filter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VARIOUS MFR Fits: 1.8L L4 | PTK22 | 🇺🇸 US 🇨🇦 CA | Trans. code 35 | View on Amazon |
This table covers the replacement filters for this application — the table heading and notes say which circuit. Typical signs include restricted flow — long cranking, weak airflow, or dirty fluid after a short interval. Seat the new filter so it cannot bypass, and use the grade the notes call for.
One part is listed for the 1977 MG MGB — VARIOUS MFR PTK22.
Fluid Pan Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ATP Fits: 1.8L L4 | RG9 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the gaskets that seal the Fluid Pan. 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.
One part is listed for the 1977 MG MGB — ATP RG9.
Fluid Pump Repair Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WJB / INMOTION PARTS Fits: 1.8L L4 | WS99168 | 🇺🇸 US 🇨🇦 CA | Frontwith Borg-Warner T65 Transmission | View on Amazon |
This table covers the precision wear sleeves used to restore a transmission pump seal surface.
This group shows a single part: WJB / INMOTION PARTS WS99168.
Fluid Pump Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WJB / INMOTION PARTS Fits: 1.8L L4 | WS480479H | 🇺🇸 US 🇨🇦 CA | Frontwith Borg-Warner T65 Transmission | View on Amazon |
This table covers the seals at the Fluid Pump. 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.
This group shows a single part: WJB / INMOTION PARTS WS480479H.
Transmission Fluid
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE Fits: 1.8L L4 | VV3246 | 🇺🇸 US 🇨🇦 CA | Max Life Multi-Vehicle or Maxlife Multi-Vehicle Full Synthetic ATF1 Quart | View on Amazon |
| VALVOLINE Fits: 1.8L L4 | 773775 | 🇺🇸 US 🇨🇦 CA | Max Life Multi-Vehicle or Maxlife Multi-Vehicle Full Synthetic ATF1 Gallon | View on Amazon |
| VALVOLINE Fits: 1.8L L4 | 881051 | 🇺🇸 US 🇨🇦 CA | Maxlife Multi-Vehicle Full Synthetic ATF5 Gallon Bay Box | View on Amazon |
This table covers the automatic-transmission fluids specified for this gearbox. Typical signs include harsh or delayed shifts, fluid that smells burnt, or a shudder at light throttle. Use exactly the specification in the notes. Automatic transmissions are unforgiving of the wrong fluid.
VALVOLINE supplies the 3 Transmission Fluid parts for the 1977 MG MGB.
This group includes VALVOLINE VV3246, VALVOLINE 773775 and VALVOLINE 881051.
Transmission Fluid Additive
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ATP Fits: 1.8L L4 | AT202 | 🇺🇸 US 🇨🇦 CA | Automatic Transmission Fluid Synthetic Protectant | View on Amazon |
This table covers the conditioners and additives used with this transmission fluid.
One part is listed for the 1977 MG MGB — ATP AT202.
Transmission Mount Bushing
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ENERGY SUSPENSION Fits: 1.8L L4 | 101101G | 🇺🇸 US 🇨🇦 CA | Performance PolyurethaneTransmission Buffer Mount Set | View on Amazon |
This table covers the Transmission Mount bushings. Typical signs include a clunk over bumps, or a torn or walked-out bushing you can see. Press the new bushing square. A cocked bushing will tear in a few thousand miles.
This group shows a single part: ENERGY SUSPENSION 101101G.
Buying Automatic Transmission Parts for a 1977 MG MGB
On this vehicle, the automatic transmission covers the automatic gearbox and its supporting cast — filters, coolers, solenoids, mounts and torque-converter parts.
- Match the engine first. Every automatic transmission part here is 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 filter and pan gasket with every fluid service, and flush the cooler lines when replacing a failed unit.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Transmission Fluid and Extension Housing Seal .
Frequently Asked Questions
How many automatic transmission parts fit the 1977 MG MGB?
Our catalog currently lists 11 automatic transmission parts for the 1977 MG MGB across 8 subcategories and 6 brands, covering both the 1.8L L4 and the 3.5L V8. Each part is matched to the engine(s) it fits.
Do automatic transmission parts differ between 1977 MG MGB engines?
Yes. Every automatic transmission part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. 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 automatic transmission problems on a 1977 MG MGB?
Common symptoms include delayed or harsh engagement, slipping under load, fluid that smells burnt, or shuddering at light throttle around 40 mph. 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 filter and pan gasket with every fluid service, and flush the cooler lines when replacing a failed unit.
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 1977 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 1977 MG MGB?
First match the engine — each row shows which engine(s) the part fits. Then use exactly the fluid specification in the notes — automatic transmissions are the least forgiving component on the vehicle about fluid choice. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 1977 MG MGB
Automatic Transmission Parts for Other MG MGB Years
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