So I recently purchased a 2005 Dodge with the 5.9 Cummins and Auto Tranny. The truck has 26000 mi an air rade intake and a full magnaflow exhaust system. I took it to the dealer where I bought it because there was a flux in when shifting into overdrive. It was intermintent but enough to drive me nuts. Supposedly they replaced the valve body but I've still noticed the same thing ocurring. I have had the transmission tested on a computer at a friend's shop and everything reads fine. Does anyone have suggestions?