How to Change the Fluid in a 4T65E Transmission

The General Motors 4T65E transmission is used in four-wheel-drive automatic transmissions produced by the company between 1997 and 2000 (as well as most 3400 model engines since 2000). Every 30,000 miles or two years, GM recommends that owners change the engine's transmission fluid. Changing the fluid keeps gears shifting smoothly and prevents debris from building up and causing costly engine damage. This maintenance requires only a few tools and about an hour's work.

Step 1 - Place the front of the vehicle on a pair of jack stands. Ensure these are placed on a level surface. Slide underneath the vehicle and locate the transmission drain pan near the center of the engine, off to the driver's side. The drain pan is large metal box surrounded by eight bolts. Lay a five-quart collection pan beneath the drain pan to catch falling transmission fluid.

Step 2 - Remove seven of the eight bolts surrounding the drain pan with a 1/2-inch socket wrench. Wait 10 to 15 minutes while the fluid drains into the collection pan below. Hold the transmission drain pan with one hand and remove the final bolt. Lower the remainder of the fluid into the collection pan. Wash out the drain pan to remove the built-up fluid.

Step 3 - Remove the transmission filter under the drain pan by taking out the three bolts holding it in place with the socket wrench. Attach the new filter. Replace the drain pan and lower the car from the jack stands.

Step 4 - Pop the engine hood and locate the transmission dipstick above the drain pan. Pull out the dipstick and place a funnel in the tube. Pour in three quarts of fluid. Replace the dipstick and close the hood.

THINGS YOU'LL NEED: 2 jack stands, 1/2-inch socket wrench, Collection pan, New transmission filter, Funnel, 3 quarts ATF+4 transmission fluid

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