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 1730 (AUTOMATIC TRANSMISSION OVERHAUL - 4 SPEED-MU4)REPAIR INSTRUCTIONSCOUNTERSHAFT ASSEMBLY REPLACEMENTTOOLS REQUIRED
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Tools Required
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Tools Required
WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
- J 37271 Countershaft Locknut Spanner Wrench. See Special Tools and Equipment .
- J 36513 Large Bearing Split Plate. See Special Tools and Equipment .
- J 22912-01 Bearing Split Plate. See Special Tools and Equipment .
- J 26900-6 Dial Caliper. See Special Tools and Equipment .
- J 37273 Countershaft Pressing Button. See Special Tools and Equipment .
- J 35287 Countershaft Bearing Race Installer. See Special Tools and Equipment .
- J 8092 Driver Handle. See Special Tools and Equipment .
- J 37278 Countershaft Inner Race Support Disc. See Special Tools and Equipment .
- J 34826 Hub Nut Wrench. See Special Tools and Equipment .
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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.