Hello Guys, New here. Have been working for Cummins for almost 30 years. (engine production plant) I have a question on one of my baby's. Auto trans in '94 2500 w/ Cummins diesel shifting in & out of overdrive. I have tapped (adjusted) the linkage from: won't even shift out of first gear without letting up to: will shift into OD but when I accelerate slightly it will drop out of OD. Is this an issue anyone else has encountered?