Putting Se transmission in GT

Asked by Travis Jun 19, 2014 at 12:54 PM about the 1999 Pontiac Grand Am 4 Dr GT Sedan

Question type: General

I have a 99 GT and the tranny went. I purchased a low mileage used tranny for a V6 se by
accident. Will the difference in gear ratio be a problem with compatibilty? Does the ecu
need to be reflashed?

1 Answer
10,665

Norm answered 9 years ago

The SE and GT used different gear ratios. Will it work? Yes, but you will have poor acceleration and poor gas mileage. Not sure about flashing the ECU - the trans needs to run the program it was built for. I would put that tranny on Ebay and get the right one.

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