WJB / INMOTION PARTS Standard Replacement Transfer Case Shift Shaft Seal — direct fit for Mercury Mountaineer 4.0L V6 (1999-2001). Genuine quality replacement built to OEM tolerances, ships to all 50 USA states from RevXSC.
Engineered by WJB / INMOTION PARTS as a standard replacement grade transfer case shift shaft seal for the 4.0L V6 engine, this WS330385 matches factory mounting points and form factor so install requires no modification. Fits 4WD or AWD; w/ Borg-Warner 4404 Transfer Case; 2 Speed or AWD; w/ Borg-Warner 4403 Transfer Case; 2 Speed Standard replacement spec — the same dimensions, materials and performance envelope as the original factory part.
Search by any number below — they all match WJB / INMOTION PARTS WS330385:
| Year | Make / Model | Engine | Notes |
|---|---|---|---|
| 1999 | Mercury Mountaineer | 4.0L V6 | Fits 4WD or AWD; w/ Borg-Warner 4404 Transfer Case; 2 Speed or AWD; w/ Borg-Warner 4403 Transfer Case; 2 Speed |
| 2000 | Mercury Mountaineer | 4.0L V6 | Fits 4WD or AWD; w/ Borg-Warner 4404 Transfer Case; 2 Speed or AWD; w/ Borg-Warner 4403 Transfer Case; 2 Speed |
| 2001 | Mercury Mountaineer | 4.0L V6 | Fits 4WD or AWD; w/ Borg-Warner 4404 Transfer Case; 2 Speed or AWD; w/ Borg-Warner 4403 Transfer Case; 2 Speed |
Always replace transfer case shift shaft seal components in matched sets where applicable, torque fasteners to factory spec, and inspect adjacent drivetrain components for wear during installation. If you're not sure which variant matches your VIN, send us the last 8 digits of the VIN before checkout and we will confirm fitment.
Is WS330385 a direct replacement?
Yes — WJB / INMOTION PARTS WS330385 is built to OEM form/fit/function for the Mercury Mountaineer 4.0L V6 (1999-2001).
Do you ship to my state?
We ship to all 50 USA states. Tracking is provided.
What's the difference between Economy, Standard Replacement and Heavy Duty?
Economy is the value-priced option for everyday driving; Standard Replacement matches OEM spec; Heavy Duty uses upgraded materials for towing, fleet and severe service.
How can I confirm fitment?
Match year, make, model and engine (1999-2001 Mercury Mountaineer 4.0L V6). When in doubt, send your VIN — we verify before dispatch.
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Note: The product image is for illustrative purposes only. Actual product may vary slightly in appearance, packaging, or labeling. Fitment and specifications are guaranteed to OEM standards.