Duramax LBZ/LMM/LML A40, A50 and T87 TCM Tuning

Send us a stock read of your 6 speed Allison A40, A50 or T87 TCM and we will adjust the transmission as required, firmer shifts, all around better driveability and adjust shift points as required.

When ordering, add tire size and or gear ratio to the notes if not stock