This procedure drains and refills the front differential fluid on a 2014 Ram 2500 with 4WD, ensuring proper lubrication of the front axle assembly.

Warnings

Tools required

Parts

• Front differential cover gasket × 1 — Mopar 68003706AA or equivalent
• RTV silicone gasket maker (if reusable gasket not available) × 1 — Mopar High Temp RTV or equivalent

Fluids

• 75W-90 GL-5 Gear Oil — 1.5 qt

Preparation

1. Park vehicle on level surface and apply parking brake
2. Place wheel chocks behind rear wheels
3. If differential has been driven recently, allow 15-20 minutes for fluid to cool to warm (not hot) temperature
4. Raise front of vehicle and support securely on jack stands at frame contact points
5. Verify vehicle is stable and level before working underneath

Procedure

1. 1

   Access front differential
   Locate the front differential assembly centered between the front wheels. Identify the differential cover on the rear-facing side of the axle housing. The cover is a large oval or rectangular plate secured with multiple bolts. Clean the exterior of the differential cover and surrounding area with a wire brush to prevent contamination during service.
2. 2

   Locate fill and drain points
   Identify the fill plug on the front of the differential housing (typically a square head plug on the driver side of the nose). Confirm you can access and remove the fill plug before draining. The differential uses a cover removal method for draining rather than a drain plug.
3. 3

   Remove fill plug
   Using the appropriate socket or square drive, remove the fill plug from the differential housing. This ensures the fill hole is accessible after draining and prevents being unable to refill if the plug is seized. Set the fill plug aside in a clean location.
4. 4

   Drain differential fluid
   Position drain pan directly beneath the differential cover. Loosen all differential cover bolts gradually in a crisscross pattern, but do not fully remove them initially. Once all bolts are loose, carefully remove the lower bolts first, allowing fluid to begin draining in a controlled manner. Support the cover as you remove the final bolts to prevent it from falling. Remove the cover completely and allow all fluid to drain into the pan. This will take several minutes.
   Torque spec

   Differential Cover Bolts35 Nm (26 lb-ft)
5. 5

   Inspect and clean cover and housing
   Inspect the drained fluid for excessive metal particles, which may indicate wear issues. Check the differential cover magnet (if equipped) for metal shavings - a small amount is normal. Thoroughly clean the differential cover and gasket mating surface on the axle housing using a gasket scraper and shop rags. Remove all old gasket material and RTV sealant. Clean the cover magnet if present. Wipe clean the interior accessible portion of the housing, being careful not to contaminate gear oil on ring and pinion.
6. 6

   Install new gasket and cover
   Install the new differential cover gasket onto the cover, ensuring proper alignment with all bolt holes. If using RTV silicone instead of a gasket, apply a continuous 3mm bead around the inside of the bolt holes on the cover mating surface. Position the cover against the axle housing, aligning all bolt holes. Install all differential cover bolts finger-tight first, then tighten in a crisscross pattern to specification using a torque wrench. This ensures even compression of the gasket and prevents leaks.
   Torque spec

   Differential Cover Bolts35 Nm (26 lb-ft)
7. 7

   Refill differential with gear oil
   Using a fluid transfer pump or squeeze bottle with nozzle, add 75W-90 GL-5 gear oil through the fill hole. Fill until gear oil begins to seep out of the fill hole - this indicates proper level. The front differential capacity is approximately 1.5 quarts, but fill to the proper level regardless of quantity used. Allow a few moments for fluid to settle and top off if necessary.
8. 8

   Reinstall fill plug
   Clean the fill plug threads and inspect the plug seal or gasket. Replace if damaged. Thread the fill plug into the housing by hand to prevent cross-threading, then tighten securely with a ratchet. The fill plug does not have a specified torque value - tighten firmly but do not over-torque as this may strip the aluminum housing.
9. 9

   Clean up and inspect for leaks
   Wipe down the differential cover and housing to remove any spilled gear oil. Inspect all around the differential cover gasket area for signs of leakage. Check that the fill plug is secure. Lower the vehicle from jack stands and remove wheel chocks.
10. 10

    Test drive and final inspection
    Start the vehicle and allow it to run briefly, then engage 4WD mode if possible (follow owner's manual guidelines for 4WD engagement). Drive the vehicle for 5-10 minutes, including turning maneuvers to circulate the new fluid through the differential. Return to a level surface, allow the differential to cool briefly, then perform a final inspection underneath for any signs of fluid leakage around the cover gasket and fill plug. Address any leaks immediately.

Reassembly

1. Ensure differential cover bolts are torqued in proper sequence to prevent gasket distortion and leaks
2. Verify fill plug is reinstalled securely before lowering vehicle
3. If RTV silicone was used instead of a gasket, allow 1 hour cure time before driving vehicle

Verification

• Confirm no fluid leaks are present around differential cover or fill plug after test drive
• Verify proper fluid level by removing fill plug - fluid should be at bottom of fill hole threads when vehicle is level
• Listen for any unusual noises from front differential during test drive - properly filled differential should operate quietly
• Confirm 4WD engages properly if equipped and front axle operates normally

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