4EyedTurd1

iTrader: (1)

Helping a buddy out and before we pull the tranny I wanted to run it by the experts. Suburban ran fine, wife parked it and got in the next day and it won’t move at all, to the point of pulling the driveshaft to get it on the trailer because it wouldn’t roll when put in neutral. You can start it and run it thru the gears and the motor acts normal when put in gear but no output shaft movement at all. I can give it gas in gear but nothing happens and then it won’t come out of drive unless I turn it off. Just trying to rule everything out before pulling the tranny.

mrvedit

I don't understand what you mean by "it won’t come out of drive unless I turn it off". Other than that, it almost sounds like the shifter is not working. I don't recall a single other post here where the trans acted like it was in Park.

Assuming the shifter is fine, I would first drop the pan and confirm that the internal mechanism for disengaging Park is working.

4EyedTurd1

iTrader: (1)

I can’t shift it out of drive at all unless I shut it off. I’ll get someone to run the shifter while I’m under it. I feel the detents as I run the shifter and here the motor unload when I put in neutral.

4EyedTurd1

iTrader: (1)

https://www.youtube.com/watch?v=HeZL...ature=youtu.be

This is with the shift linkage disconnected and running it by hand all the way down and back to park. I’m not sure if the brake switch or column has any effect on the transmission engaging.

mrvedit

Since you have now eliminated any problem with the shift linkage, I would next look at the internal linkage to the Park prawl.

4EyedTurd1

iTrader: (1)

Ok, simple obvious linkage I’m assuming?

bbond105

Yes, it’s a simple design. Two rods are hooked to the rooster cone. The small rod is hooked the manual valve in the valve body and the larger rod goes toward the rear of the trans and operates the parking paw. Either one of these rods coming loose could cause a problem, but with not being able to move the vehicle when not in park I suspect something is wrong with the parking linkage.

4EyedTurd1

iTrader: (1)

I pulled the pan and manually ran the linkage but didn’t have good enough light to see the pawl side of things. I’ve got to get a good flashlight and hopefully I don’t have to drop the valve body. I don’t want to chance losing any checkballs.

bbond105

There is no reason to drop the valve body. Just verify that everything is hooked up and working properly.

4EyedTurd1

iTrader: (1)

Well it looks like the little beveled piece that pushes on the pawl is hanging on the pawl not letting it drop. I pulled that linkage out but I don’t have anything to compare it to. The spring doesn’t look broke, beveled piece slides fine back and forth until it’s close to coming off and it hangs up. I’m not sure if the end of the shaft should have a shoulder or not.

4EyedTurd1

iTrader: (1)

Should look like this?


Mushroom the tip again and rock and roll?

bbond105

With the rod removed can you turn the out put shaft? Does the beveled piece side off the end of the rod?

4EyedTurd1

iTrader: (1)

Yes and yes, well the beveled piece almost slides off the rod but hangs up close to the end. I mushroomed the end of the rod and stuck it back in and it seems to be working correctly. Output locks when you put it in park and unlocks in gear. Buddy wants to find a new parking rod, so I’m hunting for one.

mrvedit

While a pain to fix, this sure beats removing the trans.

bbond105

I would also change out the rod. Glad you found the problem.

4EyedTurd1

iTrader: (1)

Thanks guys I appreciate the help and really glad I didn’t have to pull the trans.