Originally Posted by S10 Racer
I've heard this from more than one tranny mechanic, is there any truth that changing your fluid on a high mileage tranny will cause it to start slipping or leaking??
I trust my trans guy and here is how he tells it, if you stay on top of filters and fluid changes you will extend the life of a auto trans, period.
This old story of them failing after a change often stems from when the fluid and filter was changed.
Often people don't do it until they notice the trans slipping or otherwise not working right, they flush/filter and fill and the trans fails soon after so it must have been because of the new fluid and filter, when it was going to fail with or without the fluid /filter change.
Most likely if its slipping or acting odd its not going to be fixed with new fluid.