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Jeep FC170HD Transfer Case Output Shaft Seals
Jeep Fc170Hd Transfer case output shaft seals
Starting at $61.95, AutoBuffy stocks 2 transfer case output shaft seals from National and SKF. This seal sits where the output shaft exits the transfer case housing, keeping gear oil inside and road contaminants out. When it fails, fluid leaks onto the driveshaft or skid plate, starving the transfer case of lubrication and risking costly internal damage if ignored.
Signs your Jeep Fc170Hd needs a new transfer case output shaft seal
- Puddle of reddish or amber gear oil under the center or rear of the vehicle after parking overnight
- Visible wet film or oil streaking along the rear driveshaft or front driveshaft near the transfer case yoke
- Transfer case fluid level repeatedly drops between service intervals with no other obvious source
- Burning oil smell during or after driving, caused by fluid dripping onto hot exhaust components
- Grinding, whining, or humming from the transfer case as low fluid starves internal gears and bearings
- Four-wheel-drive engagement becomes rough or inconsistent as fluid loss affects clutch pack or chain lubrication
Which transfer case output shaft seal should you buy for your Jeep Fc170Hd?
Transfer case output shaft seals vary by position (front output, rear output, or both), seal material, and whether the kit includes a new yoke seal retainer or dust lip. Confirm which output shaft is leaking before ordering — many Jeep Fc170Hd applications have separate front and rear output seals with different diameters. OEM-spec rubber compound and correct dimensional fit matter more than brand name for a part that lives in a high-heat, high-RPM environment.
OEM-Equivalent Replacement
Best for
Restoring factory performance on a daily driver
What you get
Exact-fit dimensions, factory-matched lip material, reliable long-term sealing without modification
Heavy-Duty / PTFE-Lip Seal
Best for
Towing, off-road, or high-heat use cases
What you get
Polytetrafluoroethylene lip resists heat and abrasion better than standard rubber, longer service life under stress
Seal & Yoke Kit
Best for
High-mileage vehicles where the yoke slip surface is worn or grooved
What you get
Includes the output shaft seal plus a new slip-yoke or repair sleeve to restore a clean sealing surface
Front Output Seal (4WD specific)
Best for
Vehicles leaking at the front driveshaft connection only
What you get
Sized for the front output shaft bore; do not substitute for the rear output seal even if dimensions look close
| Option | Best for | What you get |
|---|---|---|
| OEM-Equivalent Replacement | Restoring factory performance on a daily driver | Exact-fit dimensions, factory-matched lip material, reliable long-term sealing without modification |
| Heavy-Duty / PTFE-Lip Seal | Towing, off-road, or high-heat use cases | Polytetrafluoroethylene lip resists heat and abrasion better than standard rubber, longer service life under stress |
| Seal & Yoke Kit | High-mileage vehicles where the yoke slip surface is worn or grooved | Includes the output shaft seal plus a new slip-yoke or repair sleeve to restore a clean sealing surface |
| Front Output Seal (4WD specific) | Vehicles leaking at the front driveshaft connection only | Sized for the front output shaft bore; do not substitute for the rear output seal even if dimensions look close |
Transfer case output shaft seals brands we stock for your Jeep Fc170Hd
National
1 option · from $65.95
SKF
1 option · from $61.95
Replacing the transfer case output shaft seal on a Jeep Fc170Hd
Moderate⏱ 1–3 hoursFloor jack and jack stands or vehicle liftDrain pan and transfer case fluidSeal puller or flat pry toolSeal driver or appropriately sized socket for installationTorque wrench for driveshaft flange bolts
Raise and support the vehicle safely, then disconnect the driveshaft from the transfer case yoke and slide or unbolt the yoke from the output shaft. Use a seal puller to extract the old seal without scoring the bore, then drive the new seal in squarely until it sits flush with the housing. Reinstall the yoke, reconnect the driveshaft to factory specification, and refill the transfer case with the correct fluid type and quantity before testing for leaks.
Frequently asked questions
How much does it cost to replace transfer case output shaft seals on a Jeep Fc170Hd?
The seal itself starts at $61.95 at AutoBuffy. Total repair cost depends on which output shaft is leaking and labor time. A straightforward rear output seal is a modest job; a front output seal requiring driveshaft removal adds time. DIY keeps cost to the part price plus fresh transfer case fluid.
Can I drive my Jeep Fc170Hd with a leaking transfer case output shaft seal?
Short distances are possible, but it is not advisable. A leaking output shaft seal causes continuous fluid loss. Once transfer case fluid drops below the minimum level, internal gears, chains, and bearings run dry. Damage can escalate quickly from a worn seal to a failed transfer case, which costs significantly more to repair.
How long do transfer case output shaft seals last on a Jeep Fc170Hd?
Most output shaft seals last many years under normal highway driving, but service life shortens with frequent off-road use, towing, or contaminated fluid. Seals can also harden and crack from age alone regardless of mileage. Inspecting for seepage during routine fluid changes is the best way to catch wear early.
Do I need to remove the driveshaft to replace the transfer case output shaft seal on a Jeep Fc170Hd?
Yes, in most cases. Replacing the output shaft seal requires disconnecting the driveshaft at the transfer case yoke so the yoke can be pulled off and the old seal removed. On some front-output configurations, additional skid plates or crossmembers must come off first to gain clear access to the seal bore.
Should I replace both output shaft seals at the same time on my Jeep Fc170Hd?
If the vehicle has significant mileage and one seal is already leaking, replacing both the front and rear output shaft seals together is cost-effective. Labor overlap is substantial because the transfer case area is already accessible. Fresh fluid should always be refilled to the correct level after any output shaft seal replacement.
What happens if I install the wrong size transfer case output shaft seal on a Jeep Fc170Hd?
An incorrectly sized seal will leak immediately or fail prematurely. An undersized outer diameter will not seat properly in the bore; an oversized inner diameter will not grip the shaft. Always verify the part fits your specific transfer case model, not just the vehicle — some Fc170Hd years use different transfer case units with different seal dimensions.