Truck won't shift
 

I recently pulled the engine to change the flex plate. See thread: http://67-72chevytrucks.com/vboard/s...d.php?t=425605

Got everything put back together, and it's running fine, but I started to go to work and the transmission's not shifting. It'll go into reverse, drive, neutral, park, but when driving it won't shift out of first. What controlls the shifting, and what could I have messed up that would be causing this? I was so excited that I finished the job and now it seems I didn't do as good as I thought.

Re: Truck won't shift
 

Check the vacuum line that goes to your modulator on the transmission. No vacuum makes it think you are at wide open throttle so it holds first.

Re: Truck won't shift
 

is there any way you could show me a picture or diagram or something, or describe where it hooks up to what? I'm about the farthest thing from a mechanic that there is. I'm just driven into it by poverty and desperation. :) I was pretty excited when it ran after I put the engine back in. Didn't have a hell of a lot of expectations since I didn't know what I was doing at all when I started.

Re: Truck won't shift
 

http://i7.photobucket.com/albums/y25...Turbo350_1.jpg

line goes from here to carb...

Re: Truck won't shift
 

Good deal - beat me to it. So it's a hard line with rubber ends on it, goes from the nipple pointed towards the back of the truck (that is a th350, not sure which trans you have) and runs up to the back of the intake where it either plugs into the intake or the carb. Good luck, and nice work with the R&R on the flywheel!

Re: Truck won't shift
 

Thank you very much. Just came out from under the truck, and sure enough, that hose was popped off the nipple. Forgot to pull that line when I pulled the engine and it got stretched a little tight before I noticed it an disconnected it. Can't test it yet, wife's left me with 3 kids this morning (speaking of which, how hard would it be to put 4 seatbelts across the bench instead of 3?), but I should be able to get out there within a few hours and check. Pretty confident that's the problem though.

Re: Truck won't shift
 

Don't do it seat belts are a fed. safety law.

Re: Truck won't shift
 

Oh that's crap. I want to take my wife and two kids out boating without bringing the second car. Oh well.


Took it out for a spin and it shifts great. No more problems! Thanks!

Re: Truck won't shift
 

Don't feel bad. I did the same thing he second time I pulled my trans out. By then I should have known better. :)

Glad to hear you got everything working.

Slonaker