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Thread: Transmission Compatibility

  1. #16
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    Re: Transmission Compatibility

    Quote Originally Posted by SexyG6 View Post
    ya yours is a sealed trans, and your case isnt as beefy as mine id know as i put ur mmis in and the tcm controls the shift speeds so gear ratio wouldnt nessisarilly affect the shft speeds...... not to mention as i stated i confirmed thru serial number mine was indeed a 6t75 with the 70 differential......as the 70/75 has the exact same gear ratios the only difference is the 75 is stronger and has a 3.16 differential rather than a 2.77
    what is your trans out of?

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  2. #17
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    Re: Transmission Compatibility

    Quote Originally Posted by black07g6gtp View Post
    what is your trans out of?
    g6 gxp its my stock trans ive had it on no tq managment for 300+ track runs and about 40k miles with absolutely no problems at all

  3. #18
    suckit
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    Re: Transmission Compatibility

    I realize tgis thred is old but I was curious on trans compatibilty between engines I.e. 6t70 bolt to a 3.5? Shear curiousity....what about the 4t45 and the 4t65? Interchangeable? Looked and searched but couldnt find, sorry if its a repost. Thanks!

  4. #19
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    Re: Transmission Compatibility

    Quote Originally Posted by HJJ103 View Post
    I realize tgis thred is old but I was curious on trans compatibilty between engines I.e. 6t70 bolt to a 3.5? Shear curiousity....what about the 4t45 and the 4t65? Interchangeable? Looked and searched but couldnt find, sorry if its a repost. Thanks!
    im pretty sure their not.. but these guys can confirm that.

  5. #20
    suckit
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    Re: Transmission Compatibility

    Im going to preform CPR and bring this thread back. I have a 06 GTP with a 4t65 trans. My trans is going out and I have about a month left. I was looking at getting a 6t70 or 6t75 which ever will fit. Can anyone confirm that it will work and fit?

  6. #21
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    Re: Transmission Compatibility

    if you throw enough money at it.. it will work and perform flawlessly


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  7. #22
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    Re: Transmission Compatibility

    The bolt pattern should be the same. Need someone to confirm. The biggest problem is the programation. Plus, the 6 speed trannies has an integrated TCM (I think) versus the 4 speed trannies that has an external TCM located somewhere else in the engine bay. I don't know about the compatibility of the flywheel and the input shaft.

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