Thread: GTP Consistent Weird Shift Into Overdrive (4th) Only When In "D"

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  1. #1 Re: GTP Consistent Weird Shift Into Overdrive (4th) Only When In "D" 
    Moderator dsmuts's Avatar
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    It sounds to me like your trans is slipping into OD Take a video of it and we could tell you for sure. Mine used to do that before i got a tune.
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
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    01 gt z7 turbo tep trans zzp motor
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  2. #2 Re: GTP Consistent Weird Shift Into Overdrive (4th) Only When In "D" 
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    Quote Originally Posted by dsmuts View Post
    It sounds to me like your trans is slipping into OD Take a video of it and we could tell you for sure. Mine used to do that before i got a tune.
    That's what I thought at first, but wouldn't it do it when I waited til I got to 50 to put it in drive too then? It's very consistent at only happening when it is in "D" when it hits shifting speed. It doesn't do it at all if I start in 3rd and shift it myself when it gets to 50.
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  3. #3 Re: GTP Consistent Weird Shift Into Overdrive (4th) Only When In "D" 
    Killa Bee Scottydoggs's Avatar
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    the over drive wont lock up unless you let off the gas some, while in drive

    when in 3 rd and shifting it manually to 4 th it should shift fast and solid, pulling the tach right to where it should be for that speed you are traveling at.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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