The 2021 Ram 4000 has 18 automatic transmission parts with verified fitment on this page — 7 part types and 7 brands, covering both the 5.7L V8 and the 6.4L V8. Each part includes a manufacturer part number and application notes.
The automatic transmission on the 2021 Ram 4000 covers the automatic gearbox and its supporting cast — filters, coolers, solenoids, mounts and torque-converter parts. The largest groups are Transmission Fluid Additive (5 parts), Fluid Pan (4 parts) and Transmission Fluid (4 parts). The other 4 part types cover the remaining 5 parts.
The 2021 Ram 4000 was sold with both the 5.7L V8 and the 6.4L V8. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2021 Ram 4000 automatic transmission parts are LUBEGARD (5 parts), DORMAN (4 parts) and ELRING (3 parts), plus 4 more brands.
1 part on this 2021 Ram 4000 page carries a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — LUBEGARD 19610 (Transmission Fluid Additive). Click any part number to see every vehicle that part fits.
Filter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 6.4L V8 | 265850F | 🇲🇽 MX | OE FIX | View on Amazon |
| ELRING Fits: 6.4L V8 | B46460 | 🇲🇽 MX | View on Amazon |
This table covers the replacement filters for this application — the table heading and notes say which circuit. Typical signs include restricted flow — long cranking, weak airflow, or dirty fluid after a short interval. Seat the new filter so it cannot bypass, and use the grade the notes call for.
2 Filter parts for the 2021 Ram 4000 come from 2 brands — DORMAN and ELRING.
Part numbers include DORMAN 265850F and ELRING B46460.
Fluid Cooler
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 6.4L V8 | 918411 | 🇲🇽 MX | View on Amazon |
This table covers the heat exchangers that cool transmission fluid. Typical signs include fluid that overheats, a leak at the cooler fittings, or milky fluid that says coolant and ATF have mixed. Flush the lines when you replace a cooler. Cross-contamination is how a small leak becomes a transmission job.
This group shows a single part: DORMAN 918411.
Fluid Pan
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AUTOTECNICA Fits: 6.4L V8 | CY1214647PRM | 🇲🇽 MX | ÜRO SolutionsHD Aluminum Upgrade, Cooling Fins, Replaceable Filter | View on Amazon |
| DORMAN Fits: 6.4L V8 | 265850 | 🇲🇽 MX | OE FIX | View on Amazon |
| ELRING Fits: 6.4L V8 | 224210 | 🇲🇽 MX | with Seal | View on Amazon |
| SKP Fits: 6.4L V8 | SK265850 | 🇲🇽 MX | View on Amazon |
This table covers the pans that hold automatic-transmission fluid.
4 Fluid Pan parts are listed for the 2021 Ram 4000, from AUTOTECNICA, DORMAN, ELRING and 1 other brand.
Part numbers include AUTOTECNICA CY1214647PRM, DORMAN 265850 and ELRING 224210, among others listed above.
Fluid Pan Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING Fits: 6.4L V8 | 186400 | 🇲🇽 MX | with Trans.: 8-Speed Automatic Transmission | 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.
This group shows a single part: ELRING 186400.
Torque Converter Bolt
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 6.4L V8 | 13875 | 🇲🇽 MX | M8 X 1.25 X 18.00 | View on Amazon |
This table covers the Torque Converter bolts.
One part is listed for the 2021 Ram 4000 — DORMAN 13875.
Transmission Fluid
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PENTOSIN Fits: 6.4L V8 | 1058110 | 🇲🇽 MX | 1 LiterATF8 | View on Amazon |
| PENTOSIN Fits: 6.4L V8 | 1058210 | 🇲🇽 MX | 5 LitersATF8 | View on Amazon |
| PENTOSIN Fits: 6.4L V8 | 1058213 | 🇲🇽 MX | 20 LitersATF8, Gear Set | View on Amazon |
| VAICO Fits: 6.4L V8 | V600208US | 🇲🇽 MX | Special 5 L | 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.
4 Transmission Fluid parts for the 2021 Ram 4000 come from 2 brands — PENTOSIN and VAICO.
This group includes PENTOSIN 1058110, PENTOSIN 1058210 and PENTOSIN 1058213 and the remaining parts above.
Transmission Fluid Additive
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| LUBEGARD Popular Fits: 6.4L V8 | 19610 | 🇲🇽 MX | Instant Shudder Fixx2 oz | View on Amazon |
| LUBEGARD Fits: 6.4L V8 | 60902 | 🇲🇽 MX | Automatic Transmission Fluid Protectant10 oz | View on Amazon |
| LUBEGARD Fits: 6.4L V8 | 63010 | 🇲🇽 MX | Platinum Universal ATF Protectant10 oz | View on Amazon |
| LUBEGARD Fits: 6.4L V8 | 63016 | 🇲🇽 MX | Platinum Universal ATF Protectant15 oz | View on Amazon |
| LUBEGARD Fits: 6.4L V8 | 63032 | 🇲🇽 MX | Platinum Universal ATF Protectant32 oz | View on Amazon |
This table covers the conditioners and additives used with this transmission fluid.
5 Transmission Fluid Additive parts for the 2021 Ram 4000 come from LUBEGARD. The "Popular" part is LUBEGARD 19610.
Listed part numbers: LUBEGARD 19610, LUBEGARD 60902 and LUBEGARD 63010, plus the other parts above.
Buying Automatic Transmission Parts for a 2021 Ram 4000
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: Transmission Fluid Additive and Fluid Pan .
Frequently Asked Questions
How many automatic transmission parts fit the 2021 Ram 4000?
Our catalog currently lists 18 automatic transmission parts for the 2021 Ram 4000 across 7 subcategories and 7 brands, covering both the 5.7L V8 and the 6.4L V8. Each part is matched to the engine(s) it fits.
Do automatic transmission parts differ between 2021 Ram 4000 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 2021 Ram 4000?
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 2021 Ram 4000 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 2021 Ram 4000?
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 2021 Ram 4000
Automatic Transmission Parts for Other Ram 4000 Years
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