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Trinity Auto Parts supplies tested used OEM transfer cases and rebuilt transfer cases for 4WD and AWD trucks, SUVs and crossovers across the USA and Canada. The transfer case splits engine power between the front and rear axles, so the replacement has to match your vehicle exactly; we confirm the fit against your VIN before the unit ships.
We also supply transfer case shift motors and popular units such as the NP246 for GM trucks. Every unit, for manual-shift and electronic-shift applications alike, comes from a well-maintained running vehicle and is fully tested, inspected and guaranteed before it ships.
Every transfer case is inspected before it ships: the case for cracks and leaks, the chain and gears for wear, and the shift mechanism for full engagement in every range. Rebuilt units have worn internal parts replaced and are tested.
Transfer cases vary by drivetrain, transmission, shift type and output configuration, and two units that look alike can have different ratios or input splines. We match the unit to your 17-digit VIN and the ID tag on the case, and confirm fitment before dispatch.
Every transfer case ships with a warranty, up to 2 years on select parts, with the exact term on your quote. Shipping is free across the USA and Canada, return shipping is free, and delivery is typically 3–5 business days in the continental US.
We have been supplying used and rebuilt auto parts since 1990 and are BBB accredited. You talk to people who know the difference between a part-time 4WD case and a full-time AWD unit.
A tested, low-mileage used OEM transfer case is the best value for most trucks and SUVs. A rebuilt unit costs more but has new chain, bearings and seals inside. We will tell you honestly which option makes sense for how the vehicle is used.
Use the quote form on this page or call +1 725-208-4566. Tell us the VIN, whether the vehicle shifts into 4WD with a lever or a switch, and what the old unit is doing, and we will come back with options and a price.
This guide is for owners and shops replacing the transfer case on a 4WD or AWD truck, SUV or crossover. Decide first between used OEM and rebuilt, then confirm the exact model and shift type your vehicle uses.
A transfer case is the gearbox bolted behind the transmission on 4WD and AWD vehicles that splits engine power between the front and rear axles. Part-time units lock the axles together and add a low range for off-road use; full-time and AWD units include a center differential or clutch so they can stay engaged on pavement.
For most vehicles a tested, low-mileage used OEM transfer case is the best value: the factory unit at a fraction of the cost of new. Choose rebuilt if the vehicle works hard off-road or tows, or you want new chain, bearings and seals inside.
| Factor | Used OEM | Rebuilt / Remanufactured |
|---|---|---|
| Condition | Original unit from a donor vehicle, tested, mileage disclosed | Disassembled, worn chain, bearings and seals replaced, tested |
| Typical cost vs new | Often 50–70% less than a new dealer unit | Less than new, more than used |
| Availability | Widest; depends on donor supply for your exact model | Good for common models; longer lead time on rare ones |
| Best for | Daily drivers, older trucks, budget repairs | Work trucks, towing, long-term keepers |
| Component | Usually included? | Notes |
|---|---|---|
| Complete case with chain, planetary gears, shift fork and internals | Yes | The core of every assembly |
| Output flanges or yokes | Usually | As removed from the donor vehicle |
| Transfer case shift motor (electronic shift) | Varies by listing — confirmed before shipping | Many units include it; ask if you need it |
| Speed and position sensors, vent hose | Varies by listing — confirmed before shipping | Transfer yours if not included |
| Fluid, input and output seals, skid plate | No | Shops fit new seals and fluid at install |
Request a quote with the form above or call +1 725-208-4566.
The transfer case motor, often called the encoder motor or shift motor, is the electric actuator that moves the shift fork on push-button 4WD systems. When it fails the vehicle may refuse to change range, get stuck between 2WD and 4WD, or show a 4WD warning while the case itself is healthy. If the internals are sound, replacing just the motor is a much cheaper repair. We supply tested motors on their own, and many complete units include one.
The NP246 is an electronically shifted, chain-driven transfer case used in GM full-size 4WD pickups and SUVs. It offers 2WD, Auto 4WD, 4-High and 4-Low; in Auto mode a clutch pack engages the front axle as needed. We supply tested used and rebuilt NP246 units and matching shift motors. GM used several similar cases across its trucks, so send us the VIN and the tag from your unit and we will confirm it is an NP246 before quoting.
A part-time 4WD transfer case locks the front and rear outputs together, so 4WD is for loose surfaces only, and it usually offers a low range. An AWD or full-time 4WD case uses a center differential, viscous coupling or clutch so it can stay engaged on dry pavement. The two are not interchangeable even on the same model, and some vehicles use a case that does both. Send the VIN and we will check.
A shop will typically fit new input and output seals, fill with the fluid the manufacturer specifies, transfer the shift motor and sensors if they are not included, and check the driveshaft joints while everything is apart. On electronic-shift systems the shift motor position may need a relearn with a scan tool, and the control module should be checked for stored faults after the swap. Manual-shift units need the linkage adjusted so every range engages fully.
| Item | Detail |
|---|---|
| Delivery | Typically 3–5 business days in the continental US; Canada and freight items can take longer |
| Warranty | Up to 2 years on select parts; every part ships with a warranty — the exact term is on your quote |
| Returns | Free return shipping |
| Coverage | USA & Canada |
Common symptoms are grinding or whining from under the vehicle, difficulty shifting into or out of 4WD, fluid leaks from the output seals, and the vehicle popping out of four-wheel drive. On electronic-shift systems a 4WD warning on the dash is another sign. Have the fluid and shift motor checked before assuming the case itself has failed.
It varies by listing. Many of our electronic-shift transfer cases include the shift motor, but some units ship without it, and manual-shift cases do not use one. We confirm exactly what is included with you before the unit ships. If you only need the motor, we can supply a tested transfer case motor on its own.
For most trucks and SUVs a tested, low-mileage used OEM transfer case is the best value, because it is the factory unit at a fraction of the cost of new. A rebuilt unit costs more but has new chain, bearings and seals inside, which suits vehicles that tow or work off-road. Both ship with a warranty.
Yes. We supply tested used and rebuilt NP246 transfer cases for GM full-size 4WD pickups and SUVs, along with the shift motors that go with them. Because GM used several similar cases across its trucks, send us your VIN and a photo of the tag on the case so we can confirm you need an NP246 before quoting.
On push-button systems the most common causes are a failed transfer case shift motor, a wiring or switch fault, or low fluid, rather than the case itself. If the motor tries to move but the range never changes, or the vehicle is stuck between ranges, the internals may be worn. A shop scan of the 4WD control module usually narrows it down.
No. A part-time 4WD transfer case locks the front and rear outputs together and is meant for loose surfaces, usually with a low range. An AWD or full-time unit uses a center differential or clutch so it can stay engaged on dry pavement. They are not interchangeable even on the same model, so tell us which system your vehicle has.
Yes. We ship transfer cases across the USA and Canada, and shipping is free. Typical delivery is 3 to 5 business days in the continental US; deliveries to Canada and freight items can take a little longer. Your quote includes an estimated delivery time for your address.
The 17-digit VIN is the most important item, because it tells us the drivetrain and transfer case your vehicle was built with. Add the year, make, model, engine size, transmission type, and whether the vehicle shifts into 4WD with a lever or a switch. A photo of the tag on the case and the shift motor helps us confirm the match.
Return shipping is free, so you are not stuck with the wrong unit. We match every transfer case to your VIN and the tag on the case and confirm fitment before dispatch, which keeps fitment problems rare. If something is still wrong, contact us at +1 725-208-4566 and we will arrange the return and the correct part.
