Trans Shifting [Archive] - Forum


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11-20-2005, 10:36 PM
My first post here, hope I have this in the right place.

My wife has a 99 GAGT. I changed the transmission fluid and I noticed it started to slip some. A buddy works at a dealership and flushed the entire system for me and did some program update to it. Does anyone know what the update was? The car does not shift like it used to. They are not as firm and the 2-3 and 3-4 are starting to slip. She does not run the car hard all the time, but time to time it wll not down shift. Any ideas what I am missing here?