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Thread: 2015 Yukon Denali 8 speed shift pattern

  1. #1
    Tuner in Training 67firebird455's Avatar
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    2015 Yukon Denali 8 speed shift pattern

    I want to change the shift RPM to 6100 rpm from 5800 but can't seem to do this. When I edit shift RPM, I get a big delay between shifts. I have removed 'torque management' and it feels great now, even in Tow/Haul (shifts at 5800), but normal mode runs up to 5800, doesn't climb any higher, pauses, then shifts into the next gear. Wondering if it's something obvious. If not, I'm happy to share my tune.
    67 Firebird - 4.8L, LS6 Cam, 6.0 heads, S476 T4-83mm, 9" w/3.25s, 3500 stall, TH400.

  2. #2
    Advanced Tuner RandomEnthusiast's Avatar
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    Post the tune if you don't mind. But I have a feeling you didn't modify the speed tables unless in the newer pcms it's changed but I don't see why it would be.

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    Tuner in Training 67firebird455's Avatar
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    I didn't, I thought that referenced "As long as I'm above this".
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    67 Firebird - 4.8L, LS6 Cam, 6.0 heads, S476 T4-83mm, 9" w/3.25s, 3500 stall, TH400.

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    Speed in the part throttle and full throttle in the 100% tables need to match the WOT shift RPM as well.

  5. #5
    Tuner in Training 67firebird455's Avatar
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    Quote Originally Posted by Sneakyws6 View Post
    Speed in the part throttle and full throttle in the 100% tables need to match the WOT shift RPM as well.
    So I will need to play with these numbers to get close to my shift rpm of 6100?
    67 Firebird - 4.8L, LS6 Cam, 6.0 heads, S476 T4-83mm, 9" w/3.25s, 3500 stall, TH400.

  6. #6
    Advanced Tuner RandomEnthusiast's Avatar
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    Yes.

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    Hmm interesting. Mine is doing this too but first to second gear is even more stupid. If I disable TM with the buttons my truck will try shifting from first to second at 5800 a couple times. However what it does is it hits 5500 rpm at which point it hangs up... feels like it's slipping... hits 5800 rpm and then finally goes. Maybe feels like slipping is a bad way to put it... it just stops pulling.... then the engine slowly makes 5800 and shifts.... it's a really screwed up feeling. Then after doing this a couple times it just shifts at 5500 rpm and stays there until I key cycle again. I will try and closely match my vehicle speed to my shift RPM then and see if I can rectify this.... I too want a 6000 or 6100 rpm WOT shift point and would love to have the TM off..... I have enabled it again and I just don't have any love for it. My tires are stock size but I do believe even so the WOT MPH is quite a bit off.
    Last edited by Badass69; 05-14-2016 at 09:03 AM.