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Thread: 99 black box 4l80E will not stay locked

  1. #1
    Advanced Tuner
    Join Date
    May 2012
    Posts
    212

    99 black box 4l80E will not stay locked

    I have a 99 k3500 7.4 truck with 4l80E trans and do allot of towing and do allot of driving on country roads and I lift of the gas allot for turns and what ever else. I towed my camper last weekend and just from the house to town (4 Miles) I unlocked torque convertor 8 times just lifting foot more than 4% above 0 tps. I have been reading all over and seen were rewiring with relay and using 60e tune. Trying not to go cutting and tapping in to the wiring. Here is a copy of my tune to see what tables I have available. Please help I know I am wasting gas and building heat with it doing this.

  2. #2
    Advanced Tuner
    Join Date
    May 2012
    Posts
    212
    I looked at a 02 express van and it has the table minimum throttle release which I believe is what I need so all I am seeing is doing the 0411 swap as a option but not sure how many credits I have to burn to do all this.