Originally Posted by ttttmaxx

The batteries are 2 brand new Optima Reds. This is when this problem first showed its ugly head. The truck was running and shifting perfectly based on Dptuner settings. One weekend I decided to put new batteries in because the old ones were getting aged. I disconnected the old ones and installed the new ones. When we text drove immediately after installing these new batts the shift points when back to stock. After some hard runs (15-20 minutes) the Dptuner shifts returned. Truck ran fine until the other day when the stock shifts returned????Maxx