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  1. #1
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    Default Which Tranny do I have in my '03 GT?

    I recently aquired my Dad's old 2003 Grand Prix GT and I'm not sure which tranny it has (4T65E or 4T65-E HD). Is there a way for me to tell by the VIN number?

  2. #2
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Default Re: Which Tranny do I have in my '03 GT?

    A NA 3800 runs the regular 4T65e.

    The HD version is put in the supercharged cars. Only the diff, gear ratio and passenger side axle length. Not much but if you installed the wrong one it wouldn't work right.

    SMGPFC Member #1

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