Test driving this truck its an 04 3500 98k miles auto 4inch lift 4inch straight pipe fast fuel system.
Not sure if there's a tune or not on it but stomping on it from a stop shifts fine all 3 gears but them to 4th it revs to 3500 rpms and stays that way
Shifts fine as soon as I let off a little
is this just normal for one maybe a bands adjustment or what?

 

well i was gonna take the truck for the day, and they said they wont sell it to me now, i guess i ****** them off

must mean that trans is shot and they dont want to sell it to someone who knows it is

 

My truck is doing this exact same thing and I just got it back from having the tranny rebuilt.