How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask sprinkles08 Your Own Question
sprinkles08
sprinkles08, ASE Certified Technician
Category: Transmissions
Satisfied Customers: 22377
Experience:  Chrysler/Dodge/Jeep master tech ASE Master and Advanced Certified, Chrysler/Dodge/Jeep Master Certified, Trans Specialist
9825021
Type Your Transmissions Question Here...
sprinkles08 is online now
A new question is answered every 9 seconds

Dodge 2500 pikup: I have a 2001 Dodge Cummings. The transmission

Customer Question

I have a 2001 Dodge Cummings. The transmission does not shift into over drive. from 0 to 55 it shifts fine. I can get up to 70 but that drives the tach up.
Marty
Submitted: 1 year ago.
Category: Transmissions
Expert:  sprinkles08 replied 1 year ago.
Hello and welcome to JustAnswer!
There are a handful of things that could be preventing it from shifting into fourth.
It could be an accelerator pedal positions sensor issue. It relies on throttle angle for up and downshift timing.
It could be the overdrive clutch solenoid.
IT could be a mechanical failure in the overdrive unit, a failure of the overdrive clutch, or the overdrive clutch piston may be leaking.
The first step in diagnosing the problem will be checking for fault codes. If the overdrive clutch is being commanded on but isn't applying then there should be a fault code set.
If it had slipped leading up to it not engaging at all then piston leakage/clutch failure would be likely.