The 1955 Austin A40 has 16 automatic transmission parts with verified fitment on this page — 7 part types and 7 brands, covering the 1.2L L4 engine. Each part includes a manufacturer part number and application notes.
The automatic transmission on the 1955 Austin A40 covers the automatic gearbox and its supporting cast — filters, coolers, solenoids, mounts and torque-converter parts. The largest groups are Extension Housing Seal (5 parts), Fluid Pump Seal (3 parts) and Fluid Pan Gasket (2 parts). The other 4 part types cover the remaining 6 parts.
Every part on this page is matched to the 1.2L L4 — the only engine offered in the 1955 Austin A40.
The most listed brands for 1955 Austin A40 automatic transmission parts are NATIONAL (4 parts), SCHAEFFLER (4 parts) and WJB / INMOTION PARTS (4 parts), plus 4 more brands.
1 part on this 1955 Austin A40 page carries a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — NATIONAL 7300S (Extension Housing Seal). Click any part number to see every vehicle that part fits.
Extension Housing Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NATIONAL Popular | 7300S | 🇺🇸 US | Borg Warner trans.Long Boot Style | View on Amazon |
| NATIONAL | 5203 | 🇺🇸 US | Includes Bushing | View on Amazon |
| SCHAEFFLER | SS2737 | 🇺🇸 US | with 1.685 In Shaft | View on Amazon |
| WJB / INMOTION PARTS | WS7300S | 🇺🇸 US | Borg Warner trans.Long Boot Style | View on Amazon |
| WJB / INMOTION PARTS | WS5203 | 🇺🇸 US | with Borg-Warner DG200 Transmission | 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.
5 Extension Housing Seal parts are listed for the 1955 Austin A40, from NATIONAL, WJB / INMOTION PARTS and SCHAEFFLER. NATIONAL 7300S carries the "Popular" badge.
Listed part numbers: NATIONAL 7300S, NATIONAL 5203 and SCHAEFFLER SS2737, plus the other parts above.
Fluid Pan Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO | TOS18106 | 🇺🇸 US | View on Amazon | |
| VICTOR REINZ | 711496800 | 🇺🇸 US | 14 Bolt | 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.
2 Fluid Pan Gasket parts for the 1955 Austin A40 come from 2 brands — FEL-PRO and VICTOR REINZ.
Part numbers include FEL-PRO TOS18106 and VICTOR REINZ 711496800.
Fluid Pump Repair Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NATIONAL | 99199 | 🇺🇸 US | Borg Warner Trans. | View on Amazon |
| WJB / INMOTION PARTS | WS99199 | 🇺🇸 US | Shaft Maximum Diameter (In): 2.0030000000000001 In | View on Amazon |
This table covers the precision wear sleeves used to restore a transmission pump seal surface.
2 Fluid Pump Repair Sleeve parts are listed for the 1955 Austin A40, from NATIONAL and WJB / INMOTION PARTS.
Part numbers include NATIONAL 99199 and WJB / INMOTION PARTS WS99199.
Fluid Pump Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BCA | NS331107N | 🇺🇸 US | Front | View on Amazon |
| NATIONAL | 331107N | 🇺🇸 US | FrontBorg Warner Trans. | View on Amazon |
| WJB / INMOTION PARTS | WS331107N | 🇺🇸 US | FrontBorg Warner Trans. | 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.
3 Fluid Pump Seal parts are listed for the 1955 Austin A40, from BCA, NATIONAL and WJB / INMOTION PARTS.
This group includes BCA NS331107N, NATIONAL 331107N and WJB / INMOTION PARTS WS331107N.
Output Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO | 7300S | 🇺🇸 US 🇨🇦 CA | Gold | View on Amazon |
| SCHAEFFLER | SS2723 | 🇺🇸 US | Booted (Long)33.24 mm Width | View on Amazon |
This table covers the seals at the Output Shaft. 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 Output Shaft Seal parts for the 1955 Austin A40 come from 2 brands — ACDELCO and SCHAEFFLER.
Listed part numbers: ACDELCO 7300S and SCHAEFFLER SS2723.
Torque Converter Repair Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SCHAEFFLER | SR3511 | 🇺🇸 US | with 2.00 In Shaft0.375 In Width | View on Amazon |
This table covers the wear sleeves used to restore a Torque Converter seal surface.
One part is listed for the 1955 Austin A40 — SCHAEFFLER SR3511.
Torque Converter Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SCHAEFFLER | SS3033 | 🇺🇸 US | 2.75" O.D. X 0.38" Width | View on Amazon |
This table covers the seals at the Torque Converter Shaft. 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.
One part is listed for the 1955 Austin A40 — SCHAEFFLER SS3033.
Buying Automatic Transmission Parts for a 1955 Austin A40
On this vehicle, the automatic transmission covers the automatic gearbox and its supporting cast — filters, coolers, solenoids, mounts and torque-converter parts.
- Confirm you have the 1.2L 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 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: Extension Housing Seal and Fluid Pump Seal .
Frequently Asked Questions
How many automatic transmission parts fit the 1955 Austin A40?
Our catalog currently lists 16 automatic transmission parts for the 1955 Austin A40 across 7 subcategories and 7 brands, covering the 1.2L L4 engine. Each part is matched to the engine(s) it fits.
What are the signs of automatic transmission problems on a 1955 Austin A40?
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 1955 Austin A40 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 1955 Austin A40?
Every part on this page is matched to the 1.2L L4 engine. 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 1955 Austin A40
Automatic Transmission Parts for Other Austin A40 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.