I recently rebuilt a 700R4 out of a 1986 Chevy S10. After installing it in the new car and running it, i've noticed a few issues.

The first thing that i noticed, was that i had no reverse. This wasn't a big deal since I could cope with it.

The second thing i noticed was that the car's a lot slower. I can be running the engine at almost 2000 rpm's before it gets going. It feels weak in every gear that i've gotten it into so far.

The third thing that i noticed was that i had no fourth gear. i've heard that putting the back of the car on jack stands and spinning the tires to about 100 mph until the trannsmission shifts should get it to work; but i have yet to try that yet.

The fourth thing that i noticed was that my torque converter doesn't lock-up. I understand that the trannsmission controls this even if i have a switch so i'm assuming that this is associated with having no fourth gear. btw, I am using a manual switch for the torque converter.

 

Do you work in a trans shop? It takes a person trained in it to successfully rebuild one. Many years ago a friend and I tried to swap the insides of a good trans to a bad trans and he had a lot of the same problems you have. When it comes to auto trans it is best left to the pros. Now manual trans is a whole different story much easier

 

i've got pictures from before the rebuild as we were tearing it apart if that'll help.
I forgot to mention that we also added a shift kit.

 

okay, here's a link to like 17 pics.
http://s158.photobucket.com/albums/t...r4%20teardown/
if there's something in particular you need to see, i could try and find a picture of it.
These are pictures of the teardown of the tranny, not us putting it together so that's why everything's so dirty.

The transmission was in fairly decent shape. nothing was broken, and the worst damage we saw was a little wear on a couple of the clutch packs.

 

Any ideas?

or am I better of just taking it apart again to recheck it all?

 

2 questions.
1) How do you cope with a car that cant reverse?

2) if its an 1986, wouldnt that be a 350 transmission? (It could explain why you only have 3 gears) .

 

 

did you ever resolve the problem? im about to try to rebuild my 4L60 and am wondering if i am going to have any complications

 

take it to a professional, trannies are the only thing i wont think to tackle on a vehicle, there is a reason why there are so many specialists in this field, you do need special tools to make sure it is done properly, and styxonice said there was a little burning on the clutchs...he should have replaced them rebuilding a trans is more than just taking it apart and putting it back together, there are things you have to look for and if you dont know to look for them then i would sugest taking it in, now to get the most bang for your buck i would sugesst removing the trans yourself, but other than that find a pro

 

did you check all your end play measurements? clutch pack clearances? Did you check to see if all your valve body valves moved freely? Did you put all the check ***** in the right place? Is your reverse sprag freewheeling in the right way? Whats your line pressure? Automatic transmission are extreamly touchy. My friend tried to rebuild a th350 and he couldnt figure where one thrust washer went so he threw it out. He got maybe 30 miles.

I've built many transmission including the 700r4, th400, 4l80e, 4t40, 4t65, 6r60, 41te ect....and everything has to be perfect. its not like suspension or brake work where anyone can figure how to put that stuff together. Your best bet is to bring it to a good shop before you start breaking hard parts because unlike clutches, bearing, and washers hard parts will cost you a ton of money. a planatery alone will run you a few hundred.

its either tci or b&m that makes it but theres a kit that engages the torque converter clutch when the trans shifts into forth gear by using the valve in the valve body. I would recommend that over a manual switch. the converter clutch will last much longer.