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Thread: T87A Unlock Question

  1. #1
    Potential Tuner
    Join Date
    Apr 2016
    Posts
    3

    T87A Unlock Question

    I have a 2017 silverado 5.3 reg cab with the 6l80e transmission

    Im In the process of converting it to the 8l90e transmission
    I already have the complete harness off an 8spd truck and Tcm. My question is when I send it in to unlock ,they ask for the VIN ....confused of which VIN to use...my original off my truck(6l80) or the VIN off an 8spd file ? I know I’ll have to flash in a 8spd file on the ECM as well.

  2. #2
    Advanced Tuner ZeroBoostBuick's Avatar
    Join Date
    Aug 2008
    Location
    S.W. Ontario Canada
    Posts
    322
    Open a ticket with their support service.

    Login on the main hptuners.com website and on the top right you'll have a Contact link.

    if Possible, I would give them both Vin #'s. just specify which which.

    Vin # from the vehicle the TCM came from : xxxxxxxxx

    Vin # of the vehicle it's going into : xxxxxx