2006 - 2007 GM 6.6L LBZ Duramax | Transmission Tuning by PPEI

Well tuned shift points

Had ECM tuning done from CAN company, ran better but could certainly tell it needed trans tuning. Decided to try the TCM tuning with PPEI, and couldn’t be any more impressed. Had a few issues getting TCM tune loaded, very responsive and helpful with emails going back and forth. Needed a stock tune read, instructions were clear and precise with everything that was needed. Would 100% recommend, and wouldn’t think twice about ECM tuning if it was available in US.

Transmission tune

I had requested for 2nd gear start in 4wd high and low and that's exactly what I got. Works as should and improved shift when driving.

Truck is shifting better then ever!