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Re: gt60E tranny to 6t65e tranny conversion in 97 GPGT
Welcome to AF.
You most likely have a 4T60E not the 4T65E. Only the 97 GTP had the 4T65E-HD tranny back then. Look on your SPID label on the back of the trunk lid. M13=4T60E. M15 = 4T65E. MN7 = 4T65E-HD.
To put a 4T65E in to yours you will need to replace the complete tranny/engine wiring harness and the PCM module as a minimum.
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