The 2021 Ram 4000 has 7 drivetrain parts with verified fitment on this page — 5 part types and 1 brand, covering both the 5.7L V8 and the 6.4L V8. Each part includes a manufacturer part number and application notes.
The drivetrain system on the 2021 Ram 4000 moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware. The largest groups are Differential Cover Gasket (2 parts), Transfer Case Shift Shaft Seal (2 parts) and Axle Shaft Seal (1 part). The other 2 part types cover the remaining 2 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.
Every drivetrain part listed for the 2021 Ram 4000 comes from ELRING.
Each part number listed for the 2021 Ram 4000 opens a page with every vehicle that part fits.
Axle Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING Fits: 6.4L V8 | B15220 | 🇲🇽 MX | Material: FPM (fluoride rubber)Radial Shaft Seal Design: KS | View on Amazon |
This table covers the seals where an axle shaft exits the 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.
This group shows a single part: ELRING B15220.
Differential Cover Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING Fits: 6.4L V8 | B15210 | 🇲🇽 MX | Material: AEM (Ethylene Acrylate Rubber) | View on Amazon |
| ELRING Fits: 6.4L V8 | B15230 | 🇲🇽 MX | View on Amazon |
This table covers the gaskets that seal the Differential Cover. 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 Differential Cover Gasket parts for the 2021 Ram 4000 come from ELRING.
Part numbers include ELRING B15210 and ELRING B15230.
Differential Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING Fits: 6.4L V8 | B15240 | 🇲🇽 MX | View on Amazon |
This table covers the seals at the Differential. 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 2021 Ram 4000 — ELRING B15240.
Drive Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING Fits: 6.4L V8 | B15590 | 🇲🇽 MX | Flange Seal | View on Amazon |
This table covers the seals at the Drive 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: ELRING B15590.
Transfer Case Shift Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ELRING Fits: 6.4L V8 | B15450 | 🇲🇽 MX | Material: AEM (Ethylene Acrylate Rubber) | View on Amazon |
| ELRING Fits: 6.4L V8 | B15480 | 🇲🇽 MX | Material: FPM (fluoro rubber)/ NBR (nitrile-butadien-rubber) | View on Amazon |
This table covers the seals at the Transfer Case 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.
ELRING supplies both parts for the 2021 Ram 4000.
Part numbers include ELRING B15450 and ELRING B15480.
Buying Drivetrain Parts for a 2021 Ram 4000
On this vehicle, the drivetrain system moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware.
- Match the engine first. Every drivetrain 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 differential or transfer-case fluid with any axle or seal job while everything is already open.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Differential Cover Gasket and Transfer Case Shift Shaft Seal .
Frequently Asked Questions
How many drivetrain parts fit the 2021 Ram 4000?
Our catalog currently lists 7 drivetrain parts for the 2021 Ram 4000 across 5 subcategories and 1 brand, covering both the 5.7L V8 and the 6.4L V8. Each part is matched to the engine(s) it fits.
Do drivetrain parts differ between 2021 Ram 4000 engines?
Yes. Every drivetrain 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 drivetrain problems on a 2021 Ram 4000?
Common symptoms include clicking in tight turns, a clunk when shifting between drive and reverse, vibration that builds with speed, or gear oil on the inside of a wheel. 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 differential or transfer-case fluid with any axle or seal job while everything is already open.
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 a torn CV boot caught early is a cheap boot kit; caught late it is a whole axle — inspect before deciding which to buy. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 Ram 4000
Drivetrain Parts for Other Ram 4000 Years
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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.