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.
Axle Ratio & Identification
General Motors uses several types of different axles. The 7 1/2", 8 1/2" and 9 1/2" axles can be distinguished from the others by the configuration of their housing covers and by the number of attaching bolts. To determine the drive axle ratio, refer to the below DRIVE AXLE RATIO IDENTIFICATION article in this section.
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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.