drivetrain

Differential Fluid Change - Front

for 2023 Chevrolet Bolt EUV 65 kWh Single Motor FWD · FWD

Difficulty

Easy

Time

30 min

Tools

Steps

This procedure covers draining and refilling the front differential fluid on the 2023 Chevrolet Bolt EUV electric vehicle, including inspection of the differential cover and gasket.

Warnings

⚠Ensure the vehicle is in Park with the parking brake engaged before raising the vehicle. The high voltage system does not need to be disabled for this procedure.

⚠Allow the differential to cool completely before draining fluid to avoid burns from hot fluid.

ℹ️The electric drive unit uses Dexron VI ATF in the integrated differential, not traditional gear oil.

Tools required

Floor jack and jack standsEssential

Wheel chocksEssential

10mm socket and ratchetEssential

19mm socket for lug nutsEssential

Torque wrench (10-150 Nm range)Essential

Oil drain pan (minimum 4 quart capacity)Essential

Fluid transfer pumpEssential

RTV silicone sealant (GM P/N 12378521 or equivalent)Essential

Gasket scraper

Shop towels

Nitrile gloves

Wire brush

Parts

Differential cover gasket × 1 — Use OEM specification

Fluids

ACDelco Dexron VI ATF — 1.5 qt

Preparation

Park vehicle on level surface and engage parking brake
Place wheel chocks behind rear wheels
Allow differential to cool to ambient temperature if recently driven
Raise front of vehicle with floor jack and support securely on jack stands
Remove both front wheels for access

Procedure

1
Access differential cover
Locate the differential cover on the front electric drive unit. Clean the exterior of the cover and surrounding area with a wire brush and shop towels to prevent contamination when opened.
2
Remove differential cover bolts
Using a 10mm socket, loosen all differential cover bolts in a crisscross pattern. Leave two bolts at the top partially threaded to prevent the cover from falling when the seal breaks.
3
Drain differential fluid
Position the drain pan below the differential cover. Carefully remove the remaining cover bolts and allow the cover to tilt down, draining fluid into the pan. Once fluid stops draining, fully remove the cover and set aside. Allow at least 5 minutes for complete drainage.
4
Inspect and clean differential
Inspect the drained fluid for metal particles or debris. Examine the differential gears visually for damage or unusual wear. Clean the differential cover mating surface on the drive unit housing using a gasket scraper, removing all old gasket material and RTV sealant. Clean the differential cover mating surface as well.
5
Prepare differential cover
Install the new differential cover gasket onto the cover. Apply a continuous 2-3mm bead of RTV sealant around the cover mating surface, ensuring the bead is on the inboard side of the bolt holes. The sealant must be applied even when using a gasket.
6
Install differential cover
Position the differential cover with gasket and sealant onto the drive unit housing. Thread all differential cover bolts by hand to ensure proper alignment. Tighten bolts in a crisscross pattern to the specified torque.
Torque spec
Differential Cover Bolts34 Nm (25 lb-ft)
7
Fill differential with fluid
Locate the differential fill plug on the drive unit (typically on the upper portion of the housing). Remove the fill plug. Using a fluid transfer pump, add approximately 1.5 quarts of ACDelco Dexron VI ATF through the fill hole until fluid reaches the bottom of the fill plug opening. Reinstall the fill plug.
8
Reinstall wheels
Mount both front wheels back onto the hubs. Thread all lug nuts by hand, then tighten in a star pattern to the specified torque.
Torque spec
Wheel Lug Nuts136 Nm (100 lb-ft)

Reassembly

Allow RTV sealant to cure for at least 1 hour before driving the vehicle
Lower vehicle from jack stands and remove wheel chocks
Verify parking brake is released before test driving

Verification

Check differential cover for any signs of fluid leakage around the gasket after 24 hours
Take a short test drive and recheck fluid level at fill plug - top off if necessary
Verify no unusual noises from the front drive unit during operation
Dispose of used ATF fluid according to local environmental regulations