I have a 94 F-250 4X4, with the 7.3L IDI Diesel. It drove fine, shifted hard once. Then, while driving it all gears just stopped. No gear works anymore, and you can run the Transfer Case through neutral while the transmission is in park. I pulled the pan on the transmission, and found a bolt from the center of the valve body laying in there, I put it back in (it wasn't stripped) and the tranny still didn't do anything. I don't think that it is the torque converter because it isn't discolored. Could it be the Solenoids? My neighbor told me it could be that the coast solenoid is stuck open. When driving before this happened, when I would let of the gas, the truck acted like it had a jake brake on it, and bogged down hard. Right now, I have no idea what to do, I am not a tranny guy. Any help would be greatly appreciated. Thank you.

 

The solenoids can't do this.

Would you explain "and you can run the Transfer Case through neutral while the transmission is in park?" I have no idea what that means. It might be a clue if I understood it.

 

There is a neutral safety switch on the transmission that does not allow the Transfer case to shift through neutral while the Transmission is in park. The transfer case has (in order from front to back) 2wd, 4wd high, neutral, 4wd low. With the transmission in park the transfer case should not be able to run through neutral, or from 2wd to 4wd low. However, my truck will.

 

right.the t-case shouldn't be able to be shifted into N or 4lo unless the trans is placed in N.somethings up with the t-case so id investigate there first.
merry xmas guys!

 

What should I investigate? I am not a Tranny guy, and I haven't done anything with a Transfer case before.

 

If the transfer case failed and is causing the truck to not move, the transfer case also would cause the park gear in the transmission to not keep the truck from rolling. You could test this by putting the transfer case in 2 high and the transmission in park and try moving the truck by hand. One person could probably move the truck on a hard cement or asphalt surface.

If a failed transfer case was the problem though, the transmission would probably grind when placed in park from a gear with the engine running.

 

The E4OD trans in your truck is 100% computer controlled and bang shifting and false neutrals are classic signs of a sensor or wiring/connector problems, so you need to pull the codes to see what's up. Does your speedo work normally?

 

not 100% but close.without electrical power at all to the trans, he should still have reverse and high gear in D.with nothing at all.not even R and a t-case that will shift into N/4lo while in park suggests the t-case is.......like many of us.on holiday.

 

I disagree. The transfer case should be able to shift into Neutral or 4wd without shifting to neutral. It can be done on Park. Assuming it's a manual shift transfer case. There is no interaction or feedback from/to the transmission Neutral safety switch.

I have done it on numerous OBS trucks.

 

interesting.somethings wrong with mine then.

 

Could you please explain that a bit more. I replaced the neutral safety switch, and it did nothing.

 

All I am saying is the transfer case has a mechical function. There is no interlock.

 

Would you get zero response from the transmission if the coast solenoid was stuck open?

 

No, you would not. There is NO solenoid that can cause zero response. The only way you can get zero response is if something mechanical has broken.