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Thread: 4L80E 4 to 2 Downshift

  1. #1
    Electronic Ignition!
    Join Date
    Nov 2015
    Location
    Maryland
    Age
    33
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    12

    4L80E 4 to 2 Downshift

    I have an '01 Silverado 2500HD with the 6.0 Vortec and 4L80E. I recently got HP Tuners and started playing with the tuning. I can't seem to get rid of this issue: If I'm going 40 or so and already in fourth gear and I need to pass or accelerate to merge, I floor it and get an immediate downshift, but only to third. It takes literally about five seconds until it downshifts again into second gear and actually starts pulling. Sometimes, that's fine, I only really need the one downshift, but other times I really need it to get up and go and that's when it really frustrates me. What can I do in the trans settings to get rid of this? Or could it be an issue in the valve body or something else with the hardware? Thanks!
    1990 Cadillac Brougham with all original VIN 7 GM TBI roller 350. 78,000 miles, 3.23 rear, rebuilt and upgraded 700R4 with 1500 stall. Engine upgrades include: Ultimate TBI mods, big air cleaner, SMOG pump/system delete, cat delete, high flow y pipe.

  2. #2

  3. #3
    Fuel Injected! roughneck427's Avatar
    Join Date
    May 2012
    Location
    Fresno CA
    Age
    48
    Posts
    271
    What OS are you working with? HP is missing the downshift tables

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