OD shifts too early up and down

[Rennarooster]

Hey guys I just recently bought a 94 cummins and seem to have an issue with over drive shifting too early and 3rd gear not revving it full potential and just goes right into OD and bogs out a bit but when it gets to speed and I let off it just slams into 3rd gear and over revs the engine and scares me a bit need help???

 

[rotohead]

You should fill out your signature info. You're not giving people very much info on the type and components of your truck. People will be more willing to help you if they're not asked to guess what you have and what the answer might be to your questions. I for one have no idea on what a 94 model year has as a trans or any other stuff on it. Good luck.