Only Dexron® type automatic transmission fluid is recommended by the manufacturer for use in all Powerglide, Torque Drive, and Turbo-Hydra-matic transmissions. Use Dexron® II type fluid only on 1978-79 cars.
Check the fluid level when the transmission is warm. Be sure that the car is parked on a level surface. With transmission in Park and the engine running, withdraw the transmission dipstick at the rear of the engine compartment, wipe it clean, and reinsert it. Withdraw the dipstick again and observe the fluid level reading. If the fluid level is at or below the "add" mark, add Dexron® fluid to bring the transmission fluid to the correct level. When replacing the transmission dipstick, be sure that it is seated firmly in the transmission filler tube.
DRAIN & REFILL
For most models in normal service, the automatic transmission fluid should be changed at 24,000 mile intervals on cars built between 1962 and 1974, 30,000 miles on cars built from 1975-1977, and 60,000 miles on cars built in 1978 and 1979. However, for cars which are frequently driven in heavy city traffic or are used for trailer towing, fluid changes should be performed at 12,000 mile intervals for vehicles made before 1975, and 15,000 miles for vehicles made in 1975 and later years. Careful attention to fluid change intervals as established for various types of operating conditions is essential for long transmission life and reliable service.
To drain the transmission fluid, proceed as follows:
- Run the engine for one minute in neutral.
- Switch off the ignition. If the car has been raised on a hoist, be sure that it is level. Otherwise, raise the car from the rear only.
- Place a container under the transmission below the transmission oil pan. On older models remove the oil pan plug and allow the transmission fluid to drain thoroughly into the container. On models without a drain plug, start removing the pan bolts at the front right corner allowing the fluid to drain. When the fluid has drained, remove the pan and replace the gasket.
- Replace the drain plug or pan and refill the transmission with approximately two quarts of Dexron® type fluid. Dexron® II type fluid is required on all cars in 1976 and later years. This fluid is compatible with Dexron® fluid and may be used to replenish fluid lost or drained from older cars.
- Remove the container and lower the car.
- Start the engine and allow it to idle for a few minutes.
- With the parking brake engaged, move the selector momentarily to each gear position, ending in the neutral position.
- Run the engine at about 900 revolutions per minute (rpm) until the transmission fluid is warm, then add enough fluid to bring the fluid level to the full mark on the transmission dipstick.