700 wont shift

[guz71]

Took the truck in this weekend to have a new transmission pan seal put on because the old one was leaking just a bit and it was free. Tranny has about 3000 miles on it now and was working flawlessly until I had this done. So they put the new seal in and fill it back up and off I go. I immediately notice the truck shifting a little harder. Then it wouldnt shift till it built up a little more revs. Drove about 20 miles got home and parked it. Go to the store and the truck is now reving real high before it shift and doesnt want to go into OD. Take off from another light and it just keeps reving up and will not shift out of first. Reverse and first work fine but it engages pretty hard going into drive. Tried to manually shift with no luck. According to the guage the tranny was not getting hot either. Went home checked the fluids, fine. I also pulled out the gorvernor and the gear and it was in perfect shape So I am begging to think its something big. I dont think it could be the TV cable seing as it went out within 20 miles? Any ideas? I would just like to have some sort of idea before I tow in tommorow

 

[Avery4jc]

Mine did the same exact thing...tranny was running perfectly fine (a little slippery but none the less shifting and running fine in my dd) and then on the way to school one morning I was driving along about 1/2 way there (10 mile trip to school each morning) and out of nowhere it just went...tried to accelerate and I had nothing...wouldn't get out of 1st but I still had reverse.

I had a complete new tranny put in so I don't know exactly what caused it but with 700's it doesn't have to be a gradual thing, once they snap its gone.

 

[bigblock72]

Sounds like the TV cable needs to be adjusted, I don't know why they would have played with the TV cable when they pulled the pan but apparently they did.
Simple to adjust so give it a shot.

 

[Avery4jc]

could be it but I snapped my TV cable in two pieces and although it was difficult I could still get it to shift...

 

[Thunder]

Somtimes some crud can get into the throttle valve and make it stick. Un hook the TV cable form the linkage and try manually moving it in and out fast with the engine running in park. If that doesn.t work you may have to pull the valve body and flush it out.

 

[guz71]

turned out to be a stuk valve, it was an easy fix. thanx for the input yall

 

[Avery4jc]

stuck valve? just for kicks can you explain for those of us that are tranny retards...

 

[guz71]

I was kind of confused myself because the tech didnt explain it very well but I had some kind of idea before. Anyways here is something I can across " The valve body is the control center of the automatic transmission. It contains a maze of a maze of channels and passages that direct hydraulic fluid numerous valves which then activate appropriate clutch pack or servo to smoothly shift to correct gear for each driving situation. Each valve has a specific function......" somehow when they took my pan off, something happened and one or some of my valves became hung up and was not working properly which wouldnt let the tranny shift. what is bizarre is how they got it to function. Put the transmission in park and floor it.... I saw it and apparently the fluid caused it to become not hung. I got 2 and 3 back right away and OD came after a few minutes of driving, trans. runs and shifts flawlessy once again....still kind of in denial since it didnt cost me anything for once....

 

[Avery4jc]

hmmm interesting...

 

[Blue85]

Yes, this sounds just like a stuck throttle valve.

The TV has no return spring in the valve body, the inner part of it just "floats" between the outer part and hydraulic pressure. Get a little spec of junk in there and it sticks. You can move it further and further in with the throttle, but nothing moves it back out. So the transmission starts acting like you're at WOT all the time.

If flipping the cable at it a few times doesn't work, you get the fun of dropping the valve body to free the valve. I actually added a small spring to my TV last time I had the throttle body out.