Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 898 (REAR DRIVE AXLE)REPAIR INSTRUCTIONSDIFFERENTIAL REPLACEMENTINSTALLATION PROCEDURE

2003 Chevrolet TrailBlazer 4.2 S, 4WD

Installation Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation Procedure

WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.

Install the ring gear, if necessary. Refer to DRIVE PINION AND RING GEAR REPLACEMENT .

Fig 1: Installing Ring Gear
Courtesy of GENERAL MOTORS CORP.
Install the differential side bearings, if necessary. Refer to DIFFERENTIAL SIDE BEARINGS REPLACEMENT .
Lubricate the differential side bearings with axle lubricant. Use the proper fluid.
Place the case, with the bearing cups installed, into the axle housing.
Support the case in order to keep the case from falling out of the axle housing.
Install the bearing caps and the bolts.
Do not torque the bearing cap bolts at this time.
Adjust the differential side bearing preload. Refer to DIFFERENTIAL SIDE BEARING PRELOAD ADJUSTMENT .
Adjust the backlash. Refer to BACKLASH ADJUSTMENT .
Perform a gear tooth contact pattern check. Refer to GEAR TOOTH CONTACT PATTERN INSPECTION .

Fig 2: Installing Bearing Caps And Bolts
Courtesy of GENERAL MOTORS CORP.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.