Results 1 to 3 of 3

Thread: 08 to 03 Silverado tranny swap

  1. #1
    Potential Tuner
    Join Date
    Nov 2024
    Location
    Minnesota
    Posts
    1

    08 to 03 Silverado tranny swap

    Im trying to put an 08 tranny in my 2003 Silverado I read a forum that said that the plugs are the same just the extra connectors for the iss if my Tcm isn?t looking for the iss will I still have issues with torque converter lock up? I?ve heard that you can just plug it in and it?ll work and I?ve heard that you?ll have shift issues and lock up issue just looking for some foresight, thanks

  2. #2
    Advanced Tuner
    Join Date
    Aug 2023
    Location
    SoCal
    Posts
    654
    Quote Originally Posted by bart06 View Post
    Im trying to put an 08 tranny in my 2003 Silverado I read a forum that said that the plugs are the same just the extra connectors for the iss if my Tcm isn?t looking for the iss will I still have issues with torque converter lock up? I?ve heard that you can just plug it in and it?ll work and I?ve heard that you?ll have shift issues and lock up issue just looking for some foresight, thanks
    It will work just fine. The other way around is what causes issues.
    Robert Moreau
    Technical Sales and Marketing Support Specialist
    TransGo
    2621 Merced Avenue El Monte, CA 91733 USA
    Calibration | Innovation |Performance
    https://transgo.com/our-products/

  3. #3
    Tuner in Training
    Join Date
    Nov 2018
    Posts
    43
    I did a swap similar to this, the only difference I had was the turbine speed sensor in the front pump housing on the later model trans didn't get used. Truck still goes hard 3 years later. Just make sure you clean out the cooler lines good, then extra good, then do it again....