9 Automatic transmission parts are listed for the 1951 Hudson Commodore Series, in 4 part types, covering both the 4.2L 254cid L8 and the 4.3L 262cid L6. Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 1951 Hudson Commodore Series, the automatic transmission covers the automatic gearbox and its supporting cast — filters, coolers, solenoids, mounts and torque-converter parts. 8 parts of the 9 listed are Extension Housing Bearing (3 parts), Extension Housing Seal (3 parts) and Fluid Pan Gasket (2 parts). The other 1 part type covers the remaining 1 part.
The 1951 Hudson Commodore Series was sold with both the 4.2L 254cid L8 and the 4.3L 262cid L6. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 1951 Hudson Commodore Series automatic transmission parts are WJB / INMOTION PARTS (2 parts), BCA (2 parts) and NATIONAL (2 parts), plus 3 more brands. Quality grades include Standard Replacement and Economy.
Each part number listed for the 1951 Hudson Commodore Series opens a page with every vehicle that part fits.
Extension Housing Bearing
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WJB / INMOTION PARTS Fits: 4.2L 254cid L8 | RB6007 | 🇺🇸 US | 2 speed trans.Trans. code Hydramatic | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BCA Fits: 4.2L 254cid L8 | NB107 | 🇺🇸 US | 2 speed trans.Trans. code Hydramatic | View on Amazon |
| NATIONAL Fits: 4.2L 254cid L8 | 107 | 🇺🇸 US | 2 speed trans.Trans. code Hydramatic | View on Amazon |
This table covers the Extension Housing bearings. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly.
3 Extension Housing Bearing parts for the 1951 Hudson Commodore Series come from 3 brands — WJB / INMOTION PARTS, BCA and NATIONAL.
The Economy section lists 1 option from WJB / INMOTION PARTS — the catalog's value-priced group. WJB / INMOTION PARTS RB6007 is listed in this group.
In the Standard Replacement grade, BCA and NATIONAL supply 2 parts: built to original-equipment specification. A representative part number is BCA NB107.
Part numbers include WJB / INMOTION PARTS RB6007, BCA NB107 and NATIONAL 107.
Extension Housing Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BCA Fits: 4.2L 254cid L8 | NS7038SA | 🇺🇸 US | Trans. code Hydramatic | View on Amazon |
| NATIONAL Fits: 4.2L 254cid L8 | 7038SA | 🇺🇸 US | 2 speed trans.with GMC Hydramatic Transmission | View on Amazon |
| WJB / INMOTION PARTS Fits: 4.2L 254cid L8 | WS7038SA | 🇺🇸 US | Width (In): 0.58199999999999996 In | 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.
3 Extension Housing Seal parts are listed for the 1951 Hudson Commodore Series, from BCA, NATIONAL and WJB / INMOTION PARTS.
Part numbers include BCA NS7038SA, NATIONAL 7038SA and WJB / INMOTION PARTS WS7038SA.
Fluid Pan Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO Fits: 4.2L 254cid L8 | TOS18024 | 🇺🇸 US | 2 speed trans.Trans. code Hydramatic | View on Amazon |
| VICTOR REINZ Fits: 4.2L 254cid L8 | 711494600 | 🇺🇸 US | 12 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 1951 Hudson Commodore Series come from 2 brands — FEL-PRO and VICTOR REINZ.
This group includes FEL-PRO TOS18024 and VICTOR REINZ 711494600.
Output Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SCHAEFFLER Fits: 4.2L 254cid L8 | SS2746 | 🇺🇸 US | 2 speed trans.Trans. code Hydramatic | 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.
This group shows a single part: SCHAEFFLER SS2746.
Buying Automatic Transmission Parts for a 1951 Hudson Commodore Series
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: Extension Housing Bearing and Extension Housing Seal .
Frequently Asked Questions
How many automatic transmission parts fit the 1951 Hudson Commodore Series?
Our catalog currently lists 9 automatic transmission parts for the 1951 Hudson Commodore Series across 4 subcategories and 6 brands, covering both the 4.2L 254cid L8 and the 4.3L 262cid L6. Each part is matched to the engine(s) it fits.
Do automatic transmission parts differ between 1951 Hudson Commodore Series 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 1951 Hudson Commodore Series?
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 1951 Hudson Commodore Series 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 1951 Hudson Commodore Series?
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 1951 Hudson Commodore Series
Automatic Transmission Parts for Other Hudson Commodore Series Years
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