OD off light??

[creighta]

I just bought this truck 300 miles ago and Every time I slow down my OD off light comes on. The trannywas rebuilt 5284 miles ago and the truck only has 157K so I don't suspect anything major. What is up?

NOTE: The shift lever is a little loose and shaky. I have also noticed that the tach drops to zero anytime I let off the go pedal. . . reads true otherwise(3:73s and 1600rpm@60mph)

 

[Russ]

Tach(Rpm) sensor is bad. It's located on the driverside next to the oil filler tube. It has two wires coming out of a 1" hex. Unplug, unscrew, go to Ford(only place available)ask for part #E5TZ-17B384-A, bed over grab ankles...

 

[creighta]

thanks for the quick response. If I ignore it will it really hurt anything?

I meen the tach, not your response

 

[Russ]

When the OD light blinks, that is the signal that means the transmission is in "limp home mode". Shifts become really firm. I drove mine like that for a few months, with no side effects, but I can't believe it's any good for the transmission. You may try cleaning the sensor and looking for bare wires where they exit the hex. Some have done that with good results.

 

[creighta]

thanks again, I think I remember seein somethin about that once

 

[towcat]

Do yourself a huge favor now. Spend the 50-75 bux on the sensor and 5 mins changing it out or spend $2600 on yet another trans in a short while. These trans need clean inputs or they will self destruct.