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.
Service Intervals
On all models, check fluid level at 15,000-mile intervals. On 4R100 equipped models and under normal service, change fluid at 30,000-mile intervals. On 4R70W equipped models and under normal service, change fluid and filter at 150,000-mile intervals. See DRAINING & REFILLING . Service all models at 30,000-mile intervals when used under the following conditions:
- In hot weather with temperature greater than 90°F (32°C), carrying heavy loads and/or in hilly terrain.
- Towing a trailer or using a car top carrier.
- In police, taxi or door-to-door delivery service.
- Extreme dusty conditions or off-road use.
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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.