Results 1 to 2 of 2

Thread: E38 - t43 - speedometer error

  1. #1
    Junior Member
    Join Date
    Aug 2018
    Posts
    17

    Default E38 - t43 - speedometer error

    I could use a sanity check here...

    I have a customer with a 2009 GM 1500. He installed a lift kit with 35" tires and 4.56 gears.
    I have tried to adjust the speedometer being 6mph off and I have had zero luck with getting it to work properly.

    In the Speedometer on the E38 I used the Speedo Calculator (like I've always done in the past) and it made adjustments to H0136 and H0139

    I then went into the T43 file and adjust the tables that have the same numbers. Basically, making sure everything matches.
    I then went into the "Ratios" folder and put in that it has 4.56.

    With that said, the truck is still 6 mph off. Which gives us an issue with trans shifting.

    Any help would be appreciated.

    T43 - 2009 GMC SIERRA 1500 (2424979) - STOCK FILE.ctzE38 - 2009 GMC SIERRA 1500 5.3L 6L80E (12630501) - STOCK FILE.ctz

  2. #2
    Joe (Moderator) joecar's Avatar
    Join Date
    Apr 2003
    Posts
    27,747

    Default

    The speedo adjustment tool has a means of entering a % correction... have you tried that...?

Similar Threads

  1. E38 and aftermarket speedometer settings
    By LS-SWAPPER in forum E37, E38 & E67 PFI ECM's
    Replies: 14
    Last Post: May 20th, 2018, 02:43 AM
  2. Replies: 6
    Last Post: June 28th, 2017, 10:30 AM
  3. E38 Speedometer Correction
    By minytrker in forum E37, E38 & E67 PFI ECM's
    Replies: 24
    Last Post: June 8th, 2012, 02:05 AM
  4. t43 checsum error
    By b18cls1 in forum 6 speed/8 speed RWD/FWD Transmission Tuning (incl T43, T76, T87)
    Replies: 10
    Last Post: December 16th, 2008, 12:35 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •