This procedure covers removal and replacement of the front differential cover gasket on a 2011-2014 Ford F-150 3.5L EcoBoost 4WD, including draining and refilling the differential with fresh gear oil.

Warnings

Tools required

Parts

• Front differential cover gasket × 1 — Use OEM specification
• RTV silicone sealant (optional backup) × 1 — Motorcraft TA-357 or equivalent

Fluids

• 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 rear wheels
3. Raise front of vehicle with floor jack and support securely on jack stands at factory lift points on frame rails
4. Allow differential to cool completely if vehicle was recently driven (minimum 2 hours)
5. Verify you have correct 75W-90 GL-5 gear oil (front differential requires different specification than rear)
6. Remove front skid plate or bash plate if equipped to access differential cover

Procedure

1. 1

   Position drain pan and loosen cover bolts
   Position drain pan directly beneath the front differential cover. Using a 3/8 inch ratchet and appropriate socket, loosen all differential cover bolts approximately 2-3 turns in a crisscross pattern, but do not remove them yet. This allows the cover to remain in place while fluid drains.
2. 2

   Drain differential fluid
   Carefully remove the lower differential cover bolts first, leaving the top bolts partially threaded. Gently pry the bottom of the cover away from the differential housing to create a gap for fluid to drain. Allow all fluid to drain completely into the drain pan (approximately 1.5 quarts). Once drained, remove remaining top bolts and carefully remove the cover.
   ⚠Gear oil will drain quickly once the seal is broken. Keep hands and drain pan positioned to avoid spills.
3. 3

   Inspect differential internals
   With the cover removed, visually inspect the ring gear, pinion gear, and internal components for excessive wear, metal shavings, or damage. Check the magnetic drain plug (if equipped on cover) for normal metal fines. Excessive metal buildup may indicate internal wear requiring further diagnosis.
4. 4

   Clean differential cover and housing mating surface
   Using a gasket scraper or plastic scraper, carefully remove all old gasket material from both the differential cover and the housing mating surface. Take care not to gouge the aluminum surfaces. Clean both surfaces thoroughly with brake parts cleaner and wipe dry with shop towels. Use a wire brush to clean the differential cover bolt threads.
   ⚠Do not allow any debris or gasket material to fall into the differential housing. Cover the opening with a clean towel if necessary during cleaning.
5. 5

   Install new gasket on differential cover
   Position the new front differential cover gasket onto the clean differential cover. Ensure all bolt holes align properly. Some gaskets are self-adhesive; others may require a thin bead of RTV silicone on the cover side only. Do not over-apply sealant as excess can contaminate the gear oil.
6. 6

   Reinstall differential cover
   Carefully position the differential cover with new gasket onto the differential housing, ensuring proper alignment of all bolt holes. Start all differential cover bolts by hand to ensure proper threading. Once all bolts are started, tighten them in a crisscross pattern to the specified torque using a torque wrench.
   ℹ️Tighten bolts gradually in multiple passes (first to 50%, then 100% torque) in a crisscross pattern to ensure even gasket compression and prevent warping.
   Torque spec

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

   Refill front differential with gear oil
   Locate the fill plug on the front of the differential housing (usually on the passenger side). Remove the fill plug. Using a fluid transfer pump or funnel with hose, add 75W-90 GL-5 gear oil until it reaches the bottom of the fill hole (approximately 1.5 quarts). Oil should just begin to seep out of the fill hole when at proper level. Reinstall and tighten fill plug.
   ℹ️Do not use rear differential fluid specification (75W-140) in the front differential. Front diff requires 75W-90 GL-5 gear oil only.
8. 8

   Check for leaks and reinstall skid plate
   Wipe down the differential cover and surrounding area with a clean towel. Inspect the cover gasket area for any signs of leakage. If equipped, reinstall front skid plate or bash plate and torque mounting bolts to specification.
   Torque spec

   Mounting Bolts31 Nm (23 lb-ft)

Reassembly

1. Reinstall any skid plates or protective covers removed during preparation
2. Lower vehicle from jack stands carefully
3. Dispose of used gear oil properly at a recycling facility or auto parts store

Verification

• Start the engine and shift the transfer case through all positions (2H, 4H, 4L, back to 2H) to circulate fluid through the front differential
• With engine running, turn steering wheel lock-to-lock several times to work fluid through CV axle components
• Re-check fluid level at fill plug after circulation - top off if necessary
• After initial test drive (10-15 miles), re-inspect differential cover gasket area for any signs of leakage
• Check for proper 4WD engagement and listen for any abnormal noises from front differential during operation

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