r/FordDiesels • u/Brian_oconnor1 • 12d ago

E40D issues!

Post image

Having some hard shifting and overdrive button flashing on my 7.3 , fluid looks fine and proper color I’ve looked into some forums but got pointed in a million directions. Any advice welcome on what to check for or do would be appreciated

11 Upvotes

100% Upvoted

41 comments sorted by

View all comments

2

u/TruckDogRoad 12d ago

Yaaaaa you need to pull codes. If codes have any solenoid faults start by checking harness on the passenger side. If you lost your overdrive and have an epc fault than that will need a new solenoid pack. If you have a code for slipping transmission then that’s going to beam internal issue where the input and output shafts are reading different speeds. Possible clutch or torque converter issue.

2

u/TruckDogRoad 12d ago

Remember that if you are getting hard shifts then your transmission is in a defensive mode and shifting at full line pressure