TH400 Upshift

Discussion in 'Transmission & Driveline Topics' started by Lee45, Nov 25, 2017.

  1. Lee45

    Lee45 Member

    May 28, 2017
    Recently rebuilt my th400 myself and it works great but I installed a trans go pro street shift kit and it's still shifting into second gear automatically even when trying to manually shift. Took the Valve body out today and the plug is still there and I verified that the 1-2 assembly was installed correctly, any ideas as to why?

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