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  1. #1 Re: 2006 GXP downshift issue 
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    Quote Originally Posted by derpyimp View Post
    I don't really understand what your issue is. Can you describe it better? The transmission isn't supposed to downshift into first gear when you're coming to a stop until you get below 10 mph. Mine typically shifts at 7 mph. So it may be something normal for this car that you're just not used to.

    Sorry should've worded it better, when slowing down from about 25 I'm getting a shudder that doesn't seem normal and it feels like the trans is fighting the brakes to stop. RPM drops low to about 5 or maybe 600 (which might be normal for these I'm not entirely sure) while stopping and the downshift feels very sluggish and delayed not a very smooth transition,feels like I have to put my foot into the brakes much more than I should have to. Scanned it and it came back with no dtc's but it has two bad abs sensors and a stability code but nothing from the trans. I did notice that under a wot pull that I'll get a clunk after letting off that sounds like a motor or trans mount that may also be the culprit under braking.
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  2. #2 Re: 2006 GXP downshift issue 
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    So the shudder occurs right at 25 mph, or constantly as you're slowing down, or intermittently? Both of my cars with the 4T65E have over 100k miles on them and will give a bit of a clunk or shudder when they downshift into 1st while coming to a stop. I don't know if it's normal or due to components wearing out, but either way, it hasn't caused any major issues for me.
    Last edited by derpyimp; 03-15-2018 at 09:48 PM.
    '04 GTP Comp-G - 14.871 @ 93.30 (6600 ft DA) - 3.6 MPS, SD headers w/ high-flow cat, Gutted stock airbox, Transgo shift kit, AL 104s, 180 tstat, GMPP front sway bar, poly control arm bushings, Tune by Dyno Brian
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