
Originally Posted by
farmtruc
If the fluid is dirty the clutches are burned up. It's very important to blow the transmission lines and cooler out completely.
Not doing this will just cause issues on the next rebuild.
A tune won't cause a trans to slip or burn up. A trans tune consists of adjusting shift points. Increasing line pressure for a better feel and removing TM.
Any tuning application available cannot change the function, the way a trans operates, so it's really hard for a tuner to hurt a trans.