Quick Answer: The Jeep JK transfer case uses Mopar ATF+4 automatic transmission fluid — roughly 2 quarts. The NV231 (non-Rubicon Command-Trac) and the NV241OR Rock-Trac (Rubicon) both take ATF+4. Fill to the bottom of the fill plug with the vehicle level.
Technical scope and sources
This reference is educational and covers common 2007–2018 Jeep Wrangler JK configurations. Exact torque values, capacities, fluid requirements, fasteners and service sequences can vary with model year, engine, axle, factory options and prior repair. Verify the exact vehicle and use the applicable factory service information before tightening a fastener or filling a component. The 2018 JK Owner’s Manual and Mopar’s maintenance schedule are starting points for 2018 operating and maintenance information; use matching documentation for other model years. Read the OffroadMe editorial standards for our source hierarchy.
Jeep JK Transfer Case Fluid Specs
- Fluid type: Mopar ATF+4 (do not substitute regular gear oil).
- Capacity: approximately 2 quarts — the true measure is filling to the bottom of the fill-plug hole.
- Transfer cases: NV231 Command-Trac (non-Rubicon) and NV241OR Rock-Trac (Rubicon).
How to Fill It
- Park level and remove the fill plug first to confirm it loosens.
- Drain via the drain plug, reinstall it, then pump ATF+4 in until it reaches the bottom of the fill hole.
- Reinstall the fill plug and check for leaks.
Confirm the exact fluid and interval in the FSM for your model year before servicing.
Recommended Fluids & Tools
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- Mopar ATF+4 — the correct transfer-case fluid
- Fluid transfer pump — pump ATF+4 into the fill hole cleanly