hey guys my buddy has a 2007 dodge 5.9liter cummins with 5000 miles on the ticker and a 6 speed tranny. he put a superchip flash pac in it and now he say the clutch slips in 5th and 6th gear when pulling hills with no load any ideas would help oh ya the tuner is set on performance and the installler told him he could leave it there because the only dif between perfornace and towing mode was the shift points and that the manuals did not matter sorry for the long post just want to give u all the info