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 205 (AUTOMATIC TRANSAXLE SERVICING)REMOVAL & INSTALLATIONCASE EXTENSION HOUSINGINSTALLATION
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Case Extension Housing: Installation
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation
WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
- Perform a differential carrier end play inspection. See appropriate OVERHAUL article. If removed, install the drive axle seal. Install the case extension housing with the axle seal and the O-ring. See Figure .
- Install the case extension housing bolts. Tighten the case extension housing bolts to specification. See TORQUE SPECIFICATIONS . Install the vehicle speed sensor. See VEHICLE SPEED SENSOR .
- Install the transaxle brace. See TRANSAXLE BRACE . Connect the right drive axle to the transaxle. Install the right drive axle to the transaxle. See appropriate AXLE SHAFTS article in DRIVELINE/AXLES. Lower the vehicle. Connect the negative battery cable.
- DO NOT overfill the transaxle. The overfilling of the transaxle causes foaming, loss of fluid, shift complaints, and possible damage to the transaxle. Fill transaxle with appropriate fluid to proper level. See LUBRICATION . Inspect for completion of the repairs. Inspect for fluid leaks.
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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.