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Re: Transmission question....
The easiest way to check even without popping the hood is look at the SPID label located in the trunk (under lid), sides of one of the doors, or under the spare tire cover. This label has all of your options, engine code, tranny code and paint codes, etc. A Grand Prix equipped with a 4T60E will have RPO M13 somewheres on the data lines. If equipped with a 4T65E the RPO is M15. The 1997 and up GTP has RPO MN7 and was introduced with a 4T65E-HD (Heavy Duty version) in the 1997 model year. Pontiac switched over completely to the M15 4T65E tranny in 1998 on all Grand Prix models.
Also, the 4T60E will have a smaller electrical umbilical cable versus the 4T65E 20 way plug.
The 1995 Grand Prix GTP has a 4T60E M13 tranny.
BTW - Your GTP does not have the wiring for a 4T65E and the PCM is totally different since it is the device that controls shifting electrically.
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