In this process, the transmission fluid should be drained and replenished at set intervals and, in particular, when the engine is quite hot, the process should not begin as it will require some time to cool down. Buy the right type of transmission fluid, a new filter, as well as a pan gasket, before the job starts. Other necessary tools are a floor jack, jackstands to support it, a drain pan that may require an eight-quart at least, newspapers and clean rags. Tire up the car on jackstands and if the front portion of the exhaust conflicts with the removal of the pan for the transmission fluid, then it is to be removed. Place the drain pan directly under the transmission pan, ordinarily you remove the bolts from three sides leaving the front side to drain. Then, when most of the fluid has gone, undo the remaining bolts and gingerly let the pan down to drain the rest. The transmission pan mounting bolts must be unscrewed and the pan can be released with a screwdriver. It is important that all the remains of the old gasket and sealant must be removed from the surface of the transmission gasket and the clean the pan with solvent if available, using compressed air for drying. Some models have magnets in the transmission pan to catch metal debris; this should be thoroughly cleaned, it is not unusual to find a small amount of metal material here, but a good quantity should lead to seeking advice from the dealer or a transmission specialist. Pull the filter straight down and up, take it out from the valve body inside of the transmission , then, apply a new seal and filter with the use of seal puller and slide hammer. Make sure the gasket surface on the transmission pan in clean, place in a new gasket, reinstall the magnet, and place in the new pan gasket. Position the pan on the transmission and put all the bolt on them tightening each of them gradually to the developed torque. One more instruction is that one has to add new fluid to the transmission, checking on the specifications as well. With the transmission in Park and the parking brake engaged turn the engine and allow it to idle, but do not race the engine. Shift the gear selector up and down through all the movement and back again to the park position and allow the engine to run a while. Examine the quantity of the fluid, which may be scarce, and then pour some more to the recommended level on the dipstick without a chance that it will be in excess of the limit. Unlock the bonnet for later checks, but beware any dripping fluids during the first few journeys and check the fluid level when the transmission is hot. The old fluid that has been removed from the transmission cannot be refilled and should be disposed in the right manner; this may be done by consulting the auto parts stores, disposal centers or the local environmental departments. On cooling the fluid can be poured into a container and transported to the disposal point instead of just sprinkling it on the ground or washing down the drain.
Posted by GMPartsGiant Specialist 
