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.
Rear Axle Lubrication
Rear axle lube quantities must be replaced every 15,000 miles (Except 3500 HD) on vehicles used for trailer towing or use in dusty conditions. Otherwise lube should be checked for condition and fluid level at each oil change. 3500 HD rear axle lube quantities must be replaced every 3,000 miles unless synthetic oil is used. 3500 HD vehicles are NOT equipped with synthetic oil from the factory.
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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.