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.
Except Bravada, Lumina APV, Silhouette & Trans Sport
Check transmission fluid level at each engine oil change. Under normal griving conditions, on vehicles under 8600 Gross Vehicle Weight Rating (GVWR), change transmission fluid and filter at 30,000 mile intervals. On vehicles over 8600 GVWR, change transmission fluid and filter at 24,000 miles.
If vehicle is used in severe service conditions (commercial use, trailer pulling, constant stop-and-go driving), change fluid and filter every 15,000 miles on vehicles under 8600 GVWR and at 12,000 miles on vehicles over 8600 GVWR.
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Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.