Service the front and rear differentials by draining old gear oil, cleaning magnetic drain plugs, and refilling with fresh manufacturer-specified lubricant.

Warnings

Tools required

Parts

• Rear differential drain plug washer × 1 — Use OEM specification
• Front differential drain plug washer × 1 — Use OEM specification

Fluids

• Mopar 75W-140 Synthetic Gear Lubricant — 2 qt
• 75W-90 GL-5 Gear Oil — 1.5 qt

Preparation

1. Park vehicle on level surface and engage parking brake
2. Place wheel chocks behind front wheels
3. Raise rear of vehicle and support securely on jack stands
4. Allow differentials to cool if vehicle was recently operated
5. Verify you have correct fluid types: Mopar 75W-140 Synthetic for rear, 75W-90 GL-5 for front

Procedure

1. 1

   Access rear differential drain plug
   Locate the rear differential housing. Position drain pan beneath the differential drain plug on the bottom of the housing. Clean area around drain plug with wire brush to prevent contamination.
2. 2

   Drain rear differential
   Remove the rear differential drain plug using appropriate socket. Allow all gear oil to drain completely into pan (approximately 2 quarts). Inspect magnetic drain plug for excessive metal debris. Clean drain plug thoroughly with shop rag. Install new washer on drain plug.
   ⚠Gear oil may drain quickly initially. Position drain pan to catch full flow.
   Torque spec

   Drain Plug55 Nm (41 lb-ft)
3. 3

   Reinstall rear differential drain plug
   Thread drain plug with new washer into differential housing by hand to avoid cross-threading. Torque drain plug to specification using torque wrench.
   Torque spec

   Drain Plug55 Nm (41 lb-ft)
4. 4

   Refill rear differential
   Locate fill plug on side or rear of differential housing. Remove fill plug. Using fluid transfer pump, add Mopar 75W-140 Synthetic Gear Lubricant through fill hole until fluid begins to seep from fill opening (approximately 2.0 quarts). Allow to settle for 30 seconds and top off if needed.
   Torque spec

   Fill Plug55 Nm (41 lb-ft)
5. 5

   Secure rear differential fill plug
   Clean threads of fill plug with shop rag. Thread fill plug into housing by hand, then torque to specification.
   Torque spec

   Fill Plug55 Nm (41 lb-ft)
6. 6

   Access front differential
   Lower vehicle and reposition jack stands to support front of vehicle securely. Position drain pan beneath front differential drain plug. Clean area around drain plug.
7. 7

   Drain front differential
   Remove front differential drain plug. Allow all gear oil to drain completely (approximately 1.5 quarts). Inspect magnetic drain plug for metal debris. Clean drain plug thoroughly and install new washer.
   Torque spec

   Drain Plug55 Nm (41 lb-ft)
8. 8

   Reinstall front differential drain plug
   Thread drain plug with new washer into front differential housing by hand. Torque drain plug to specification.
   Torque spec

   Drain Plug55 Nm (41 lb-ft)
9. 9

   Refill front differential
   Remove front differential fill plug. Using fluid transfer pump, add 75W-90 GL-5 Gear Oil through fill hole until fluid begins to seep from fill opening (approximately 1.5 quarts). Top off as needed after allowing fluid to settle.
   ⚠Verify you are using 75W-90 GL-5 for front differential, NOT the 75W-140 used in rear.
   Torque spec

   Fill Plug55 Nm (41 lb-ft)
10. 10

    Secure front differential fill plug
    Clean and install fill plug, threading by hand first. Torque fill plug to specification.
    Torque spec

    Fill Plug55 Nm (41 lb-ft)
11. 11

    Lower vehicle and verify
    Wipe down both differentials to remove any spilled fluid. Inspect drain and fill plugs for leaks. Carefully lower vehicle from jack stands and remove jack stands and wheel chocks.

Reassembly

1. Dispose of used gear oil properly at recycling center or automotive shop
2. Record mileage and date of service for maintenance tracking

Verification

• Start vehicle and allow to idle briefly, then move forward and backward slowly to circulate new gear oil
• Re-inspect both differentials for any leaks around drain and fill plugs after short test drive
• Check that differential housings are not dripping and plugs are secure

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