no overdrive

[exploder10]

In need of some help. I've got a 2000 explorer with the 4.0 and 5r55w with 4405. First off it will shift into rev 1 2 and 3 but I have no 4th or of. I've been told that maybe the speed sensor or transfer case could be causing the problem. O and I've already put another transmission in and did not change any thang thanks

 

[BrooklynBay]

Do you have a check engine light for a flashing overdrive light?

 

[exploder10]

No check engine light but od light flashes

 

[BrooklynBay]

The flashing light indicates a stored trouble code. Have the computer scanned to find out what the code numbers are. A system fault will prevent overdrive from engaging. Your transmission has a "virtual" 5th gear.