Hi I have been a diesel owner for quite a while. I fell in love with them when I witnessed what a diesel could do, its like the harder you work them the more they thrive so to speak. Well I own a 2006 dodge ram 3500 diesel with a automatic. i have already replaced my ball joint and sealed hub assemblies and u- joints in the front axle. I only have 129,xxx miles on it and now the transmission doesn't want to shift into the next gear without the motor climbing in rpms and when I let off the pedal it shifts. This happens more from first to second, and on any incline or flat stretch of road. I really don't want to get another mechanic bill so if someone could shed light to the situation I would really appreciate it thanks.