The 1955 Desoto Fireflite has 17 automatic transmission parts with verified fitment on this page — 7 part types and 7 brands, covering the 4.8L 291cid V8 engine. Each part includes a manufacturer part number and application notes.
On the 1955 Desoto Fireflite, the automatic transmission covers the automatic gearbox and its supporting cast — filters, coolers, solenoids, mounts and torque-converter parts. 10 parts of the 17 listed are Manual Shaft Seal (4 parts), Extension Housing Bearing (3 parts) and Transmission Fluid (3 parts). The other 4 part types cover the remaining 7 parts.
The 1955 Desoto Fireflite came with a single engine, the 4.8L 291cid V8, and every part is verified against it.
7 brands supply automatic transmission parts for the 1955 Desoto Fireflite, led by WJB / INMOTION PARTS (4 parts), NATIONAL (4 parts) and VALVOLINE (3 parts), plus 4 more brands. Quality grades include Standard Replacement and Economy.
Each part number listed for the 1955 Desoto Fireflite opens a page with every vehicle that part fits.
Extension Housing Bearing
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WJB / INMOTION PARTS | RB6206 | 🇺🇸 US | 2 speed trans.Trans. code A323 | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BCA | NB206 | 🇺🇸 US | 2 speed trans.Trans. code A323 | View on Amazon |
| NATIONAL | 206 | 🇺🇸 US | 2 speed trans.Trans. code A323 | 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 are listed for the 1955 Desoto Fireflite, from WJB / INMOTION PARTS, BCA and NATIONAL.
In the Economy grade, WJB / INMOTION PARTS supplies 1 part: the catalog's value-priced group. A representative part number is WJB / INMOTION PARTS RB6206.
The Standard Replacement section lists 2 options from BCA and NATIONAL — built to original-equipment specification. BCA NB206 is listed in this group.
This group includes WJB / INMOTION PARTS RB6206, BCA NB206 and NATIONAL 206.
Fluid Pan Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO | TOS18407 | 🇺🇸 US | 2 speed trans.Trans. code A323 | View on Amazon |
| VICTOR REINZ | 711490500 | 🇺🇸 US | 18 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 are listed for the 1955 Desoto Fireflite, from FEL-PRO and VICTOR REINZ.
Part numbers include FEL-PRO TOS18407 and VICTOR REINZ 711490500.
Fluid Pump Repair Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NATIONAL | 99212 | 🇺🇸 US | 2 speed trans.with Chrysler A323 Transmission | View on Amazon |
| WJB / INMOTION PARTS | WS99212 | 🇺🇸 US | Front2 speed trans. | 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 1955 Desoto Fireflite come from 2 brands — NATIONAL and WJB / INMOTION PARTS.
Part numbers include NATIONAL 99212 and WJB / INMOTION PARTS WS99212.
Fluid Pump Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NATIONAL | 6879H | 🇺🇸 US | Front2 speed trans. | View on Amazon |
| WJB / INMOTION PARTS | WS6879H | 🇺🇸 US | Front2 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.
2 Fluid Pump Seal parts for the 1955 Desoto Fireflite come from 2 brands — NATIONAL and WJB / INMOTION PARTS.
Part numbers include NATIONAL 6879H and WJB / INMOTION PARTS WS6879H.
Manual Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BCA | NS471264 | 🇺🇸 US | 2 speed trans.Trans. code A323 | View on Amazon |
| NATIONAL | 471264 | 🇺🇸 US | 2 speed trans.with Chrysler A323 Transmission | View on Amazon |
| SCHAEFFLER | SS4192 | 🇺🇸 US | 1.25" O.D. X 0.31" Width | View on Amazon |
| WJB / INMOTION PARTS | WS471264 | 🇺🇸 US | 2 speed trans.with Chrysler A323 Transmission | 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.
4 Manual Shaft Seal parts for the 1955 Desoto Fireflite come from 4 brands — BCA, NATIONAL, SCHAEFFLER and 1 other brand.
Listed part numbers: BCA NS471264, NATIONAL 471264 and SCHAEFFLER SS4192, plus the other parts above.
Torque Converter Repair Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SCHAEFFLER | SR3514 | 🇺🇸 US | 2 speed trans.Trans. code A323 | View on Amazon |
This table covers the wear sleeves used to restore a Torque Converter seal surface.
This group shows a single part: SCHAEFFLER SR3514.
Transmission Fluid
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VALVOLINE | VV3246 | 🇺🇸 US | Max Life Multi-Vehicle or Maxlife Multi-Vehicle Full Synthetic ATF1 Quart | View on Amazon |
| VALVOLINE | 773775 | 🇺🇸 US | Max Life Multi-Vehicle or Maxlife Multi-Vehicle Full Synthetic ATF1 Gallon | View on Amazon |
| VALVOLINE | 881051 | 🇺🇸 US | 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 1955 Desoto Fireflite.
Part numbers include VALVOLINE VV3246, VALVOLINE 773775 and VALVOLINE 881051.
Buying Automatic Transmission Parts for a 1955 Desoto Fireflite
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 4.8L 291cid V8 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: Manual Shaft Seal and Extension Housing Bearing .
Frequently Asked Questions
How many automatic transmission parts fit the 1955 Desoto Fireflite?
Our catalog currently lists 17 automatic transmission parts for the 1955 Desoto Fireflite across 7 subcategories and 7 brands, covering the 4.8L 291cid V8 engine. Each part is matched to the engine(s) it fits.
What are the signs of automatic transmission problems on a 1955 Desoto Fireflite?
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 Desoto Fireflite 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 Desoto Fireflite?
Every part on this page is matched to the 4.8L 291cid V8 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 Desoto Fireflite
Automatic Transmission Parts for Other Desoto Fireflite Years
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