10 Automatic transmission parts are listed for the 1957 Checker A8, in 3 part types, covering the 3.7L 226cid L6 engine. Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 1957 Checker A8, the automatic transmission covers the automatic gearbox and its supporting cast — filters, coolers, solenoids, mounts and torque-converter parts. All 10 listed parts are Extension Housing Seal (5 parts), Fluid Pan Gasket (3 parts) and Fluid Pump Repair Sleeve (2 parts).
The 1957 Checker A8 came with a single engine, the 3.7L 226cid L6, and every part is verified against it.
6 brands supply automatic transmission parts for the 1957 Checker A8, led by NATIONAL (3 parts), WJB / INMOTION PARTS (3 parts) and SCHAEFFLER (1 part), plus 3 more brands.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 1957 Checker A8. 1 part has it: NATIONAL 7300S (Extension Housing Seal). Each part number opens a page with 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 | Borg Warner Trans. | 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 for the 1957 Checker A8 come from 3 brands — NATIONAL, WJB / INMOTION PARTS and SCHAEFFLER. The "Popular" part is NATIONAL 7300S.
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 | |
| MAHLE / CLEVITE | W38987 | 🇺🇸 US | Cork-RubberAutomatic Transmission Oil Pan Gasket | 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.
3 Fluid Pan Gasket parts are listed for the 1957 Checker A8, from FEL-PRO, MAHLE / CLEVITE and VICTOR REINZ.
Part numbers include FEL-PRO TOS18106, MAHLE / CLEVITE W38987 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 for the 1957 Checker A8 come from 2 brands — NATIONAL and WJB / INMOTION PARTS.
Listed part numbers: NATIONAL 99199 and WJB / INMOTION PARTS WS99199.
Buying Automatic Transmission Parts for a 1957 Checker A8
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 3.7L 226cid L6 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 Pan Gasket .
Frequently Asked Questions
How many automatic transmission parts fit the 1957 Checker A8?
Our catalog currently lists 10 automatic transmission parts for the 1957 Checker A8 across 3 subcategories and 6 brands, covering the 3.7L 226cid L6 engine. Each part is matched to the engine(s) it fits.
What are the signs of automatic transmission problems on a 1957 Checker A8?
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 1957 Checker A8 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 1957 Checker A8?
Every part on this page is matched to the 3.7L 226cid L6 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 1957 Checker A8
Automatic Transmission Parts for Other Checker A8 Years
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