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International Automotive Technicians Network
Re: 4T65E won't upshift
Posted to Technical Discussion Forum on 1/18/2018

I haven't had a chance to look myself but I used to overhaul a lot of GM transmissions. My best friend was always a range reference chart so I would look at that. Second is a question. What gear are you taking off in when in D. Does it feel like 1st or 3rd whe... Login to read more.