Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
The biggest issue is usually the smaller tires that will cause this.It only takes a small amount to cause speed change signals like this here and smaller tires will change the speed to a faster speed as well as cause upshifting and over drive operation sooner then desired.
The other issue I have seen is a fault with the drac module as some of these vehicles used.Usually this is a calibrated module that is installed (obtained from a dealer) that matches the transmission and differential gear ratios and tire sizes.You can get these checked to get the numbers you need from these and have a GM dealer order in a correct fit drac to correct this here.It is usually situated behind the glove box area and is white in color with wiring connected to it.
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Hello I am just checking in with you to see if there is anything else I can help with here?
Let me know,thanks Pete.