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.
1996 GMC Forward Control 4.3 Z, AutomaticFACTORY OEM SERVICE PROCEDURE
Lug Nut
| Condition | Code | Procedure |
|---|---|---|
| Lug nut flats rounded | A | Require replacement of nut |
| Lug nut installed backward | B | Require repair |
| Lug nut mating surface dished | A | Require replacement of nut |
| Lug nut mating type incorrect | B | Require replacement of nut |
| Lug nut seized | A | Require replacement of nut and/or stud |
| Stud incorrect | B | Require replacement of stud |
| Threads damaged | A | Require repair or replacement of component with damaged threads |
| Threads stripped (threads missing) | A | Require replacement of component with stripped threads |
Factory Service Tools
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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.
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