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Thread: Trans braking issue in a Jeep

  1. #1
    Tuner in Training
    Join Date
    Aug 2020
    Location
    Topeka Ks
    Posts
    25

    Trans braking issue in a Jeep

    Hello, looking for some guidance on engine/trans braking. I have a 2013 5.3 (LMG) and 6l80 swapped into my 2010 Jeep wrangler (motech style kit) and for the most part, I'm pretty happy with it. Problem is when going down big hills in 4 low, using tap shift to keep it in 1st gear the engine just runs away, no dynamic braking. If I don't ride the brakes down the grade the engine will over rev and be at 3k in 1st gear pretty quick! Other guys with the same combo (and proper tune) will sometimes have to give it throttle on a big downhill to keep it moving and never touch the brake. I have attached my log from a drive I just took and the tune file with hopes that someone could take a peek and give me some pointers. My old 3.8 and Jeep trans would creep down a hill in 4 low and I really miss being able to do this, the gearing is the same in 4 low. I am pretty to new to HPtuners but learn quick and would appreciate any input.
    Thanks in advance.

    Jeff
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