This is what we do when we service an automatic transmission with a removable pan. This is a very involved process:
- We check the transmission fluid level and condition
- We road test the vehicle to verify that the transmission is functioning properly
- We raise the vehicle up on the lift to externally inspect for any fluid leaks, loose bolts, etc.
- We remove the transmission pan and filter
- We break the filter open to see if there is any debris trapped in the filter – this is a critical step because if debris is found it’s an early warning sign that something is failing internally
- We install a new transmission filter and replace the fluid that was lost when the pan was removed, generally about half the fluid in the unit, 5 quarts
- We then do a final road test, lift inspection and fluid level check
For a drain and fill, we follow the same procedures as above, except we do not pull the pan – we just pull the drain plug and then refill the transmission fluid to the proper level.
For a transmission flush, we perform all of the above steps, but we replace all of the fluid in the system. We recommend a flush if the transmission fluid has become very dark or if your transmission was contaminated with water.