I have an issue when shifting from 2nd to 3rd. No mater how long I hold the accelerator down it won't sift. I have to release the accelerator and then press it again before it it will shift into 3rd and beyond. I have changed the transmission filter, gasket, and fluid when I first got the truck. I have been doing a little research on this and found there is also a solenoid in there but wasn't sure if that would solve my issue. Anyone have any suggestions?

 

Which engine/trans do you have?

 

diesel, not sure on the transmission.

 

Likely 48RE. Its likely just an electronics problem. Changing the governor pressure sensor and solenoid *should* fix it. Get the borg warner heavy duty solenoid.