I got under my truck to pull the trans because of no overdrive, and I noticed this hanging there when I went to take off the front drive shaft. I can see the all stud it pushes onto, I just have no idea what it is or does. That picture is on the driver side of the trans, right by the shifter linkage.

 

Looks a lot like the trans end of the TV cable.....

 

After playing with it for a minute I figured out that's what it is. Is there a chance that it not being hooked up could cause me not having overdrive?

 

hook it up and find out! wonder how long that's been unhooked

 

Suppose it depends on the the throttle valve thinks you are doing with the gas.... past a certain point, it will automatically kick down. Hook it up, go for a drive, see what happens.

 

That's how I solve problems

 

Went for a drive and it shifts awesome, but still no overdrive. Shifts awesome in the other three gears. Is it possible to just switch the overdrive from my new to me trans to the trans that's in my truck or do I have to pull the trans. I know the service manual said od is serviceable without pulling the trans.....

 

you will need the special tool to insert when you pull the OD unit to keep it all aligned I believe... well, iirc you need to tool if you do not play to overhaul the unit..

 

Think I would start trying to figger out why it didn't want to go into overdrive. Might be as simple as a bad solenoid.

 

I just got done replacing the solenoid and pressure sensors. After taking a bath in trans fluid, I drove it and still no overdrive. It shifts good in the other 3 gears, and the converter is locking up. Just no overdrive. I think im just gonna put a trans in it.