Hey I have a 1997 cummins and the overfrive won't kick in any ideas???

 

could be your tps (throttle position sensor) just an idea

 

Its most likely the vss located on the end of the tranny.

 

tps. search "tps" and you will find everything you need.

 

My 1996 did the same thing. Replaced T.P.S. end of promlem

 

Ill check it out guys thanks for the help!!!!

 

ok cleaned and checked tps seams to be working fine. and this is kicking my but i it shifts fine through all other gears and has plenty of power (no slipping). i know it could be the shift solenoid is there a way to test that as well???

 

knock the set pins out and drill the holes out bigger on tps then rotate it counter clockwise to increase voltage. what voltage are you getting at wide open throttle? then i would check shift solenoids.