The 1958 Checker A8 has 31 automatic transmission parts with verified fitment on this page — 10 part types and 9 brands, covering the 3.7L 226cid L6 engine. Each part includes a manufacturer part number and application notes.
On the 1958 Checker A8, the automatic transmission covers the automatic gearbox and its supporting cast — filters, coolers, solenoids, mounts and torque-converter parts. Most of the listed parts are Extension Housing Seal (8 parts), Fluid Pump Seal (7 parts) and Fluid Pan Gasket (3 parts). The other 7 part types cover the remaining 13 parts.
Every part on this page is matched to the 3.7L 226cid L6 — the only engine offered in the 1958 Checker A8.
The most listed brands for 1958 Checker A8 automatic transmission parts are WJB / INMOTION PARTS (8 parts), NATIONAL (7 parts) and SCHAEFFLER (7 parts), plus 6 more brands.
4 parts on this 1958 Checker A8 page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including NATIONAL 7300S (Extension Housing Seal) and NATIONAL 331107N (Fluid Pump 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 | 2 speed trans.Borg Warner trans. | View on Amazon |
| WJB / INMOTION PARTS Popular | WS7300S | 🇺🇸 US | 2 speed trans.Borg Warner trans. | View on Amazon |
| BCA | NS473234 | 🇺🇸 US | Trans. code T12 | View on Amazon |
| NATIONAL | 473234 | 🇺🇸 US | Trans. code T12Borg Warner trans. | 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 | WS473234 | 🇺🇸 US | 3 speed trans.Borg Warner trans. | View on Amazon |
| WJB / INMOTION PARTS | WS5203 | 🇺🇸 US | 2 speed trans.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.
8 Extension Housing Seal parts are listed for the 1958 Checker A8, from NATIONAL, WJB / INMOTION PARTS, BCA and 1 other brand. NATIONAL 7300S carries the "Popular" badge.
Part numbers include NATIONAL 7300S, WJB / INMOTION PARTS WS7300S and BCA NS473234, among others listed 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 for the 1958 Checker A8 come from 3 brands — FEL-PRO, MAHLE / CLEVITE and VICTOR REINZ.
Listed part numbers: FEL-PRO TOS18106, MAHLE / CLEVITE W38987 and VICTOR REINZ 711496800.
Fluid Pump Repair Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NATIONAL | 99199 | 🇺🇸 US | 2 speed trans.Borg Warner trans. | View on Amazon |
| WJB / INMOTION PARTS | WS99199 | 🇺🇸 US | Shaft Maximum Diameter (In): 2.0030000000000001 In | View on Amazon |
| WJB / INMOTION PARTS | WS99193 | 🇺🇸 US | Front3 speed trans. | View on Amazon |
This table covers the precision wear sleeves used to restore a transmission pump seal surface.
3 Fluid Pump Repair Sleeve parts are listed for the 1958 Checker A8, from WJB / INMOTION PARTS and NATIONAL.
This group includes NATIONAL 99199, WJB / INMOTION PARTS WS99199 and WJB / INMOTION PARTS WS99193.
Fluid Pump Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NATIONAL Popular | 331107N | 🇺🇸 US | Front2 speed trans. | View on Amazon |
| WJB / INMOTION PARTS Popular | WS331107N | 🇺🇸 US | Front2 speed trans. | View on Amazon |
| BCA | NS331107N | 🇺🇸 US | Front2 speed trans. | View on Amazon |
| BCA | NS6988H | 🇺🇸 US | FrontTrans. code T12 | View on Amazon |
| NATIONAL | 6988H | 🇺🇸 US | FrontTrans. code T12 | View on Amazon |
| SKF | 21098 | 🇺🇸 US | Front | View on Amazon |
| WJB / INMOTION PARTS | WS6988H | 🇺🇸 US | Front3 speed 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.
7 Fluid Pump Seal parts are listed for the 1958 Checker A8, from NATIONAL, WJB / INMOTION PARTS, BCA and 1 other brand. NATIONAL 331107N carries the "Popular" badge.
Part numbers include NATIONAL 331107N, WJB / INMOTION PARTS WS331107N and BCA NS331107N, among others listed above.
Manual Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NATIONAL | 7929S | 🇺🇸 US | Trans. code T12Borg Warner trans. | View on Amazon |
| WJB / INMOTION PARTS | WS7929S | 🇺🇸 US | 3 speed trans.Borg Warner trans. | View on Amazon |
This table covers the seals at the Manual 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 Manual Shaft Seal parts are listed for the 1958 Checker A8, from NATIONAL and WJB / INMOTION PARTS.
Part numbers include NATIONAL 7929S and WJB / INMOTION PARTS WS7929S.
Output Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO | 7300S | 🇺🇸 US 🇨🇦 CA | Gold | View on Amazon |
| SCHAEFFLER | SS2723 | 🇺🇸 US | 2 speed trans.Booted (Long) | 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 1958 Checker A8 come from 2 brands — ACDELCO and SCHAEFFLER.
Part numbers include ACDELCO 7300S and SCHAEFFLER SS2723.
Repair Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SCHAEFFLER | SR3482 | 🇺🇸 US | RearA8B | View on Amazon |
| SKF | 99212 | 🇺🇸 US | Shaft Diameter: 2.125 In | View on Amazon |
This table covers the wear sleeves used to restore a grooved seal surface.
2 Repair Sleeve parts are listed for the 1958 Checker A8, from SCHAEFFLER and SKF.
Listed part numbers: SCHAEFFLER SR3482 and SKF 99212.
Shift Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SCHAEFFLER | SS3644 | 🇺🇸 US | Trans. code T12with 0.750 In Shaft | View on Amazon |
This table covers the seals at the Shift 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 1958 Checker A8 — SCHAEFFLER SS3644.
Torque Converter Repair Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SCHAEFFLER | SR3509 | 🇺🇸 US | Trans. code T12with 1.938 In Shaft | View on Amazon |
| SCHAEFFLER | SR3511 | 🇺🇸 US | 2 speed trans.with 2.00 In Shaft | View on Amazon |
This table covers the wear sleeves used to restore a Torque Converter seal surface.
SCHAEFFLER supplies both parts for the 1958 Checker A8.
This group includes SCHAEFFLER SR3509 and SCHAEFFLER SR3511.
Torque Converter Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SCHAEFFLER | SS3033 | 🇺🇸 US | 2 speed trans.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 1958 Checker A8 — SCHAEFFLER SS3033.
Buying Automatic Transmission Parts for a 1958 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 Pump Seal .
Frequently Asked Questions
How many automatic transmission parts fit the 1958 Checker A8?
Our catalog currently lists 31 automatic transmission parts for the 1958 Checker A8 across 10 subcategories and 9 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 1958 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 1958 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 1958 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 1958 Checker A8
Automatic Transmission Parts for Other Checker A8 Years
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