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Thread: Trans hits 4th hard with light/no throttle, fine with moderate throttle

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  1. #1
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    Mar 2009
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    Default Trans hits 4th hard with light/no throttle, fine with moderate throttle

    I believe this is a tuning issue, ever since I raised the speed at which the trans engages OD it's been like this. It's much worse now with the shift kit, but it's the only time the trans is harsh, so I really don't think the shift kit is to blame. If I'm coasting down a hill and the truck hits its shift speed, it drops it way hard. Same as if I'm loafing along just enough to get it up to the minimum OD upshift speed. I believe I'm to blame here, but don't know how to smooth it back out. Anyone?
    Attached Files Attached Files
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

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