Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Hello my name is ***** ***** thank you for your question.
Is the truck at a trans shop or a repair shop right now?
This type of issue is best to be taken to a transmission shop. What I would normally do for this type of issue is remove the valve body and air check the clutches to see if 4th gear is actually working. If it holds air pressure, then I would look at the valve body and solenoid operation to determine if one of the two is causing the problem.
Do you have any more questions on this?