I have a 96 Dodge Cummins 2500 Reg Cab longbox 4x4 Automatic with 148,000 miles. At 110,000 I took it to our local Cummins guru at the cummins dealer. At that time he ran the rack, fiddled with the pump and springs, set the waste gate. Reset the timming and all the other little things.
Mods so...