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Thread: allison dvt

  1. #1
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    Default allison dvt

    I had my 02 duramax on the dyno the other day and even with the dvt locked in fourth it would still upshift into 5th. It would prevent downshifts but not upshifts. Is there a way to prevent this or do I just reflash the tcm with a higher 4th-5th wot upshift before I put it on the dyno? It was still climbing at 3250 when it was shifting.

  2. #2
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    just lockout 5th gear with your gear selector. (hold the T/H button)
    '07 TBSS, LS2, T42, 3SS, Black on Black on Black, Pretty much stock at the moment. EFILive will fix that

    '06 LBZ/Allison 6speed, EC, LB, 1LT, Leather
    Current Mods: EFI Live/ PTO High Idle Mod/ Factory Exhaust Brake / BD Full Bore/ TransGo Jr./ TTS Twin Lift Pumps/ MBRP 4" turbo back/ Custom air box mod/ BullyDog Outlook Monitor

    465hp/1008tq---7/25/09---Dyno Day Fast Specialties Tuning by ME

  3. #3
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    Quote Originally Posted by bballer182 View Post
    just lockout 5th gear with your gear selector. (hold the T/H button)
    02's do not have a 5th gear lockout unless you add it by running an extra wire to the TCM and install the updated GM cal/os.
    2001 K2500HD Duramax/Allison

  4. #4
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    Quote Originally Posted by jimter View Post
    02's do not have a 5th gear lockout unless you add it by running an extra wire to the TCM and install the updated GM cal/os.
    I know what id be doing...
    '07 TBSS, LS2, T42, 3SS, Black on Black on Black, Pretty much stock at the moment. EFILive will fix that

    '06 LBZ/Allison 6speed, EC, LB, 1LT, Leather
    Current Mods: EFI Live/ PTO High Idle Mod/ Factory Exhaust Brake / BD Full Bore/ TransGo Jr./ TTS Twin Lift Pumps/ MBRP 4" turbo back/ Custom air box mod/ BullyDog Outlook Monitor

    465hp/1008tq---7/25/09---Dyno Day Fast Specialties Tuning by ME

  5. #5
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    anybody have a writeup on this or know where to find one? And where do I find an updated gm cal/os

  6. #6
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    Try This
    http://www.kennedydiesel.com/docs/Al...ut%20final.htm

    Also Go to and enter your VIN to find the latest Cal
    http://tis2web.service.gm.com/tis2web
    Last edited by jimter; March 27th, 2010 at 04:38 PM. Reason: Add info
    2001 K2500HD Duramax/Allison

  7. #7
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    thanks I'll take a look at that

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