Quick Answer: The Jeep JK rear Dana 44 holds about 2 quarts of gear oil. Factory grade is typically 80W-90 (GL-5); 75W-140 synthetic is recommended for towing, heavy loads, or larger tires. Non-Rubicon Trac-Lok limited-slip axles also need a friction modifier; the Rubicon’s electronic Tru-Lok locker does not.
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 Rear Dana 44 Fluid Specs
- Capacity: approximately 2.0 quarts. The true measure is to fill to the bottom of the fill-plug hole with the vehicle level.
- Type: 80W-90 GL-5 gear oil (standard); 75W-140 synthetic for towing, heat, or big tires.
- Trac-Lok (non-Rubicon LSD): add the specified limited-slip friction modifier.
- Rubicon Tru-Lok: no friction modifier required.
How to Fill It
- Park level and remove the fill plug (top) first — confirm it loosens before draining.
- Drain, reinstall the drain plug, then pump fluid in until it just reaches the bottom of the fill hole.
- Add friction modifier first if you have a Trac-Lok LSD.
Always confirm the exact grade on your axle tag or in the FSM for your model year.
Recommended Fluids & Tools
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- 75W-140 synthetic gear oil — best for towing and big tires
- Limited-slip friction modifier — required for Trac-Lok axles
- Gear oil fill pump — makes filling the diff far easier