700R4

Superk · October 13, 2004

Hi all, I am new to this, but some friends told me I can get some help on this forum.

I have an 89 Chevy C1500 witha 305.

here's the problem;

I found alot of metal in my dip pan which lead to the rebuild of the trans.

I rebuilt my 700R4, replaced 2-4 band steel and friction plates, basically everything that comes with a rebuild kit. Also put in a new torque converter.

after the rebuild I found I did not have overdrive selection(meaning when I selected the little D) It was pretty much like netural. I did have the Big D, and it shifted like a champ all the way to 3rd gear. Reverse works great to. I drove it around locally for three days, On the fourth day I took the truck on the highway to get a little more speed behind it. going about 50, I move the gear seletion to overdrive and it shifted, after that I had the overdrive selection from stop to finish. It no longer acted as if it was in netural and it performed great. I drove it for about 30miles on the highway, then checked the fluid, it had the burnt smell to it. I then could not shift out of 1st gear. And had the truck towed home.

I am pretty sure if I flushed the trans I would be in working order again. Is it possible that the cool line are clogged and it is not cooling properly at higher rates of speed? Or do you think I need to pull the whole thing again and start from scratch? I really dont want to do that by the way. Thanks alot

Mike G · October 15, 2004

First off, welcome aboard

Secondly, when you did the rebuild, did you tear into the valve body and clean out all the passages and check valves? If not, maybe that would be a good place to start. Also, did your shift linkage work OK when you put it all back together? Did you have enough fluid in the trans too? I know that you shoudl add, then run the motor and add again, then run throug the gears and check, then a short drive and check again. Seems like a lot, but with the converters, they can be tricky on the eye...

--Mike

Delray · October 15, 2004

Did you flush the trany cooler?did you have the correct clearances in the clutch packs?As stated above,did you clean and inspect the valve body?If your oil smelled burnt it must have gotten hot.Are there any clutch material in the bottom of the pan?if so start from scrach!I know something that you did not want to hear.

welcome to the board

Steve

budhayes3 · October 16, 2004

Definitely want to make sure that you flushed all of the old debris out of the system, even a small chunk of old clutch can block a passage in the valve body and create problems. It might not be a bad idea to add an auxilary cooler if you plan on doing any towing or hard driving. B&M makes one that seems to be popular, and I'm very happy with my PermaCool 17,000 GVW cooler also. Good luck and let us know how you made out!

Oh yea, and Welcome!

Superk · October 19, 2004

Yes I cleaned out the valve body, I manually checked all the valves for sticking. I did make sure the fuild was full before I drove off, I even stopped at atuozone,( about a 1/4 mile away) and added some more ATF there after seeing it was low. But I did not flush the radiator, something I forgot to do. All my measurement where in limits. I am going to try a Aux cooler. What size do I need? I do not plan to tow anything, its just for every day driving. If this doesnt work than I going to replace the Fwd. Sprag Clutch assy. Maybe upgrade the oil pump too. I hate to have to pull the trans again, because it's just me. Thanks again for the help, I'll keep you all posted on my findings.