i have 1999 psd 4x4 with a 4r100. got in it this morning drove home from work and never had a problem.. when i woke up to go to family activities reverse was compleatly gone, but it drives forward in RND21 and even when i put in in park it tries to move until the parkin paw engauges.. i have no idea how it can be running so great and after it is parked and started again its broke.. so confuesd any help would be much appriciated! Thanks in advance!

 

start simple...is there enough fluid in the transmission? Sorry if this has been checked already.

otherwise it might be something in the valve body? from the sounds of it a tranny flush & filter change won't help...but might.

maybe just a linkage issue

 

Your one way diode is jammed.

No fix other than to tear into it. I bet if you drive it, you will find that when OD goes to kick in, the truck will feel like it braking.

 

The only way the truck will try to move in neutral is if the trans converter is locked up in some manner.
Good luck.

 

started simple and pulled the pan just to see what the mechanical linkage looked like on the inside and some how it came off! its simple enough to fix and put back together.. but any idea how this can happen the only way ik to put it back on is to pull the main valve body and slide it in the slot as i put the body back on.. i guess what i wanta know is how in the heck would the linkage come apart? thanks again!

 

I'm sorry but my crystal ball is not working at the moment.
Good luck.

 

Mine goes forward in neutral sits still in reverse (tries to back up) and feels like it's under a load in park. Checked fluid levels and trans temp gauge never goes above half, shifts smooth through all 4 gears and 7.3 is running smooth. Is there any possible solutions besides a rebuild.

 

If you have a Diesel, the converter is a bit different.
Check with a good shop.
The torque converter begins to lock up earlier than in a gas motor.
All your experiencing is fluid drag, otherwise.
Be sure the correct fluid is used in the Trans.

 

Most likely not. Forget what Bluegrass 7 said about the torque converter. That makes no sense at all.

 

Do you believe it's a torque converter issue?

 

That's very nice of you Mark.
And offer no opinion but slam me...AGAIN..
Is that all you have to offer for an engineer?

 

Thanks bluegrass7 I feel like I'm just trying to reach anything other than forward gears are welded and I'm gonna pay some wild amount to fix it.. I just don't understand how it can shift so smooth through gears but not back up or go in neutral 😡😡 hate automatics.

 

What I offered is that it's going to need a rebuild. I also saved him time and money chasing a nonexistant torque converter issue. The torque converter could not possibly cause this issue.

 

Something is getting mixed up in translation.
My reply was to post #7.
The poster mentions a 7.2 motor. I can only take his word for that being a large Diesel motor and don't know what transmission he has.
There is now a 7.3 push rod gas motor along with a 6.2 pushrod gas motor.
Therefore I recommend he consult a shop for another opinion. as a admission I have no good answer
My further replies were off hand from experience.
I'm sorry they made no sense to you because of your interpretation..
Likely seen from an e-mail notice instead of going to the thread and seeing possible other responses..
Therefore Mark I did not appreciate your unnecessary slam.
This is what can happen by a new post (in the wrong forum) to an old thread where people don't pay attention and post something completely new.
You may disagree but at least do it in a reasonable manner.
We were replying to two different posts in the same threads.
Look at the time/date lines..
.

 

So new development I've noticed, in neutral it only goes in first gear so first is not disengaging what would cause this?