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Thread: 8 speed trucks. Adjusting shift points. Normal table?

  1. #1
    Tuner
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    Question 8 speed trucks. Adjusting shift points. Normal table?

    To adjust shift points, wouldn't we adjust the normal table on pickups? I see there's snow, mud, perf, tow, etc.

    Yesterday I adjusted it so it *should* be shifting at 6k across all gears and it didn't change at all. This has me thinking I was perhaps modifying the wrong table.

    Also, is there a writeup on the 8 speed TCM torque management? I'm afraid to touch anything because I don't know how this transmission will respond.
    2015 Ram 1500 Hemi HP Tuned
    2003 Mercedes E55 AMG Hoping to be supported

  2. #2
    Tuner
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    I got it figured out, I didn't hit every single "mode" on the new settings. Also noticed it'll rev up quicker and higher than command propshaft speed, so be prepared to command a few hundred rpm lower than the shift rpm you actually want. I also took out half of the upshift TM and it doesn't feel like its shifting too hard. I also tuned up the line pressure about 15%. Shifts beautiful at 6300 rpm for me now. Very happy with the investment.
    2015 Ram 1500 Hemi HP Tuned
    2003 Mercedes E55 AMG Hoping to be supported

  3. #3
    Check out the slip times as well. I have my max settings at 140ms and sport at 160ms.

    I also increased my shift rpms at light throttle so it doesn't blow through the gears so quickly when your cruising around.

  4. #4
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    What table is slip times located?
    2015 Ram 1500 Hemi HP Tuned
    2003 Mercedes E55 AMG Hoping to be supported

  5. #5
    Tuner in Training
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    Oct 2018
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    Quote Originally Posted by Dusty05 View Post
    What table is slip times located?
    Ever figure out the table?

  6. #6
    Potential Tuner
    Join Date
    Aug 2015
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    Hi Dusty,

    Could I ask, how did you increase your line pressure? I have a 2014, and there's no option for generall adjustment of line pressure. What I did, was increases the Upshift / Downshift Line Pressure tables around 20%... But i'm not sure if that's really the same thing? I also cut the shift times in half. For TCC settings, I copied all of the "SLIP -> LOCK" numbers to "UNLOCK -> SLIP". This effectively disabled the "controlled slip" mode for the torque converter clutch. It's either unlocked, or locked. I like the way it shifts, but i'm concerned about the line pressure setting as mentioned.

    -Kole