drivetrain

Differential Cover Gasket

for 2017 Chevrolet Silverado 1500 5.3L V8 EcoTec3 L83 · RWD

Editorial review:Chris Hackleman — Master Technician · 20+ years · Jeff Moore — Master Lexus & Toyota Mechanic · 20+ years

Difficulty

Easy

Time

1.0 h

Tools

Steps

✓Expert-verified. Personally reviewed and approved by OLP's master technicians (Chris Hackleman & Jeff Moore — 20+ years each). Always follow the vehicle's factory service information and torque specs.

This procedure covers removal and replacement of the rear differential cover gasket on a 2014-2018 Chevrolet Silverado 1500 with RWD, including draining and refilling the differential fluid.

Warnings

⚠Differential fluid may be hot if vehicle was recently driven. Allow at least 30 minutes cooling time.

⚠Gear oil has a strong odor and can stain. Work in a well-ventilated area and protect surrounding surfaces.

ℹ️The differential may hold slightly more or less than 2 quarts depending on axle configuration. Fill to proper level, not to a specific quantity.

Tools required

Floor jack and jack standsEssential

Wheel chocksEssential

3/8" drive ratchet and socket setEssential

Torque wrench (10-100 lb-ft range)Essential

Drain pan (minimum 3 quart capacity)Essential

Gasket scraper or plastic scraperEssential

Wire brush

Clean rags or shop towelsEssential

Brake cleaner or degreaserEssential

Fluid pump or squeeze bottle

Rubber mallet

Parts

Differential cover gasket × 1 — Use OEM specification or equivalent for 10-bolt rear differential
RTV silicone gasket maker (optional backup) × 1 — Use OEM specification

Fluids

ACDelco 75W-90 Synthetic Gear Oil — 2 qt

Preparation

Park vehicle on level surface and apply parking brake firmly
Place wheel chocks in front of front wheels
Allow differential to cool if vehicle was recently driven
Raise rear of vehicle with floor jack and support securely on jack stands at frame rails
Verify vehicle is stable before working underneath

Procedure

1
Position drain pan and loosen cover bolts
Position drain pan directly beneath the differential cover. Using a 3/8" ratchet and appropriate socket, loosen all differential cover bolts approximately 2-3 turns each, but do not remove completely. Start at the top bolts and work your way around.
2
Break seal and drain fluid
Carefully loosen the lower bolts slightly more than the upper bolts to allow the cover to tilt downward and break the seal at the bottom. Fluid will begin draining. Once fluid flow slows, remove the lower bolts completely while supporting the cover with one hand. Allow all fluid to drain into the pan.
3
Remove cover completely
Remove the remaining cover bolts and carefully pull the cover away from the differential housing. You may need to gently tap the cover with a rubber mallet to break the gasket seal. Keep the cover level initially to avoid spilling residual fluid, then tilt to drain completely into the pan.
4
Clean cover and housing surfaces
Use a gasket scraper to remove all old gasket material from both the differential cover and the housing mating surface. Be careful not to gouge the aluminum surfaces. Follow with a wire brush to remove remaining debris, then clean both surfaces thoroughly with brake cleaner and clean rags. Both surfaces must be completely clean and dry for proper gasket sealing.
5
Inspect differential internals
With the cover removed, visually inspect the ring gear, pinion gear, and bearings for unusual wear, metal shavings, or damage. Check the bottom of the housing for excessive debris or metal particles. If significant wear or damage is observed, further diagnosis is required before reassembly.
6
Install new gasket and position cover
Place the new gasket onto the differential cover, aligning all bolt holes. Some gaskets are adhesive-backed and will stick to the cover. If using a non-adhesive gasket, a small amount of RTV silicone at a few points can help hold it in position. Carefully align the cover with the housing and start all bolts by hand to ensure proper alignment.
7
Torque cover bolts
Torque the differential cover bolts in a crisscross pattern, working from the center outward. Torque all bolts to specification in at least two stages: first to approximately 15 lb-ft, then to final specification. This ensures even gasket compression and prevents warping or leaks.
Torque spec
Differential Cover Bolts35 Nm (26 lb-ft)
8
Refill differential with gear oil
Locate the differential fill plug on the front of the housing (passenger side). Remove the fill plug. Using a fluid pump or squeeze bottle, add ACDelco 75W-90 Synthetic Gear Oil through the fill hole until fluid begins to seep out of the fill hole. The proper level is at the bottom of the fill hole threads. Install and hand-tighten the fill plug.
9
Lower vehicle and perform final checks
Lower the vehicle from jack stands to the ground. Wipe down the differential cover and surrounding area. Start the engine and shift through all transmission gears while stationary (foot on brake), then shift into Park. This circulates fluid through the differential.

Reassembly

Ensure all cover bolts are torqued to specification in a crisscross pattern
Verify fill plug is reinstalled securely after filling to proper level
Double-check for any fluid leaks around the cover gasket before returning vehicle to service

Verification

Inspect differential cover for any signs of fluid leakage immediately after filling
After test driving vehicle for 5-10 miles, re-inspect cover gasket area for leaks
Check fluid level at fill plug after test drive to ensure proper fill level is maintained
Monitor for leaks over the next few days of normal driving

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