The O/D indicator on my 2004 Ranger with a 5R44E transmission flashes after about 20 minutes of driving. Code - P0735, "incorrect gear ratio of the 5th gear". It shifts perfectly before the light bulb flashes. After it flashes, shifting is abnormal.
If you turn off the OD before driving, switching from 1 to 4 gear occurs perfectly.
The transmission fluid is new and clean.
The level is normal
The solenoids are working properly.
The valve body is restored(+ Trans Go Shift Kit)
The sensors are serviceable.
Wiring is good
Who has faced such a situation?
What could be the reasons for this problem?
What could be the reason for the error?

 

Its slipping.
Did this start shortly after ValveBody work?
Did ValveBody old style Gasket (tends to blow out), get changed to newer BondedGasket?
Did ValveBody bolts get torqed proper?

 

The valve body is replaced with new gaskets,the bolts are tightened according to the specification.After replacing the valve body, the machine worked well

 

Let the 5r Tranny experts think about this & comment.