Originally Posted by
Z06Luke
I'm working on a 2003 2500HD that's experiencing high transmission temps and data logs seem to show slippage. This is not the type of issue I've done much troubleshooting of before, so I'm somewhat learning as I go here. The torque converter and lockup solenoid were both just replaced in attempt to solve this issue, and the transmission is beautifully clean inside, fwiw. Some spark advance tuning has been done, but no changes have been made to the transmission tuning.
I have a short log (slipping log.hpl) of freeway driving showing a constant 80% slippage, despite varying RPMs of slippage. A 2nd log (slipping log2.hpl) is attached showing more data, including times when slippage is basically 0 (1:59:12) and it still shows 80% of slippage. Tune file is also attached. Any help would be appreciated.