Automatic Transmission Fluid Change & Pan Service

Position your vehicle on a level surface. Engage the parking brake and allow the transmission to cool to ~120°F. Raise the front/rear (depending on AWD/FWD/RWD) and secure on safety stands.

Place your drain pan beneath the transmission pan. Remove the drain plug using the correct socket. Allow fluid to drain completely (usually 3-5 minutes). Do not discard yet—you'll inspect it for metal shavings or burning smell later.

Unbolt the pan evenly in a crisscross pattern to avoid warping. Gently pry the pan loose from the gasket. Once removed, you'll see the valve body and filter.

Locate the steel filter screen and magnets on the pan. Soak them in brake cleaner and scrub away sludge/debris. Use a lint-free rag to wipe the pan interior completely clean.

Remove the old filter by unbolting it or pushing out the retaining pins (depending on design). Compare the new filter to ensure exact match. Install the new filter following manufacturer arrows/orientation.

Clean the mating surface on the transmission case. Install the new gasket or apply OEM-approved sealer in a thin, continuous bead. Do not over-apply sealer—excess can break off and clog passages.

Position the pan back onto the transmission. Hand-tighten all bolts, then torque in the specified crisscross sequence. Typical specs range from 7-10 ft-lbs (85-120 in-lbs), but verify for your model.

Reinstall the drain plug with a new washer (if equipped) and torque to spec.

Locate the fill tube (often marked "ATF" or "Transmission") or fill plug on the side of the transmission. Insert your funnel with extension hose. Pour the manufacturer-specified fluid slowly.

If your vehicle has a dipstick, check level at operating temperature with the engine running and in Park/Neutral per manual instructions. No dipstick? You may need to run the engine until warm, then loosen the fill plug slightly until fluid seeps out.

Check for leaks under the vehicle. Start the engine, cycle through each gear holding the brake for 2-3 seconds per position. Listen for harsh engagement or slipping.

Take a 10-15 minute test drive covering city and highway speeds. Shifts should be firm but smooth. Recheck fluid level after cooling if equipped with a dipstick. Dispose of old fluid at a certified recycling center.

• Fluid level drops quickly after refill: Check for leaks at pan, cooler lines, or axle seals. May need additional fluid.
• Hard shifts or slipping after service: Air may be trapped. Perform a "transmission air bleed" procedure per manual. Verify correct fluid type.
• Metal flakes in drained fluid: This indicates internal wear. A fluid change won't fix it—consult a transmission specialist immediately.
• Check Engine Light on: Some vehicles require a TCM reset or adaptive learning drive cycle after fluid service.