: 700R4 Tech ?


4x4Jimmy
09-20-2004, 11:21 AM
Need to see if anyone here can help me out before I go spend $$$ at the tranny shop.

After tearing down my700r4 and assembly, it won't shift out of first gear.

If I put the rear axle on jack stands and run it, it shifts out of first gear into second just like expected. But after that it will run up to 5000 rpm and 80mph w/out shifting.

I have taken the valve body off twice now to insure the location of the check balls, and to the best of my knolodge they are in the correct location for my 92 700R4 with an auxilary valve body.

If anyone can shed any light to help me out i would greatly appreciate it.

orangefj45
09-20-2004, 12:43 PM
could be one of 2 different problems.

either the governor gear needs to be replaced, which is easy to do, or the "throttle valve" is stuck (mostlikely your problem).

the "throttle valve", also known as the TV valve, is located in the valve body where the TV cable linkage attaches.
why was the transmission removed in the first place?
did you flush out the cooler to get rid of any contamination before re-installing the trans?
di you use the same converter?
is the TV cable adjusted properly?

more details would help, and then we'll go from there.

4x4Jimmy
09-20-2004, 01:24 PM
After talking to a local transmission shop owner, he suggest taking the valve body apart and cleaning it. He agrees that the TV valve is probably stuck. He suggested checking it, and the governer.
It is a brand new cooler I installed.

I didn't replace the torque converter, because it was fairly new.

The TV cable is adjusted properly.

orangefj45
09-20-2004, 02:42 PM
was there a lot of contamination in the pan and fluid when you pulled the trans?
if so, the converter should have been replaced cause all the contaminants would have been in there as well.
if the TV valve is sticking, you have to do more than "clean" the valve body. you don't even have to pull the VB to do it.
there is an aluminum sleeve in the VB along with a steel valve. polish the valve and lightly hone the aluminum sleeve. that should fix it. also, if there is some more debris in the pan, you should run an inline filter to catch any of that crap before it can get back into the valve body and hang thinmgs up again.

4x4Jimmy
09-20-2004, 06:12 PM
not much contamination at all. I'll try working on that TV valve though. Thanks for the help.

Juice
09-20-2004, 07:52 PM
i replaced the governor in my tranny.. big waste of money.. its either that damn tv cable which is a P.I.T.A. times a thousand or its just fawked? good luck..

orangefj45
09-20-2004, 09:50 PM
i replaced the governor in my tranny.. big waste of money.. ..

what's so expensive about replacing the governor?
you can buy the gear for less than $5 and the whole new governor for $30
:confused:

4x4Jimmy
09-26-2004, 12:37 PM
Well, I pulled the whole Valve body today and everything checked out fine. Pulled the governor, everything looked fine. Only thing else i can think of is the different servo I put in there when i re-built it. I guess I'll change it out and put the old one in and see if that affects anything.

shortbus
09-26-2004, 08:46 PM
How did you adjust the cable? How did you check the governor. Did you check the governor bore in the case to see if it was worn? Try adjusting the cable all the way out. That cable and throttle valve is the 700's brain.If it shifts with the cable adjusted all the way out but to soon then adjust it back in. If it shifts when its on jack stands then the valves are moving,engine has no load,when you put it on the ground its sensing a load (downshift and stay in first gear) . Adjust cable

350sblazer
09-29-2004, 10:46 PM
sound like your skipping 2nd i had the same prob afer my overhaul next time you have your pan off if you have a air compressor apply pressure through the exaust hole below the servo on the cases machined surface for the pan to mate. if you can hear it apply. then you may have a valve body concern which is easy to check just check the valves for sticking, otherwise your 2-4 band probly fell off the anchor pin during assembly.

fyi 1st at 4500rpms if u have 3.42s is 35-40 and 2nd is around50-55 so if it shift and jump to 80 at 5000 thats definatly 3rd and if it doesn't upshift again then your not geting 4th
1-2 shift required that the 2-4 band be applied and the sprag to hold, 2-3 is disengaging the 2-4 band, sprag and i think its the forward clutches that disengage as well, then 3-4 is the 2-4 band applied and the roller clutch holding

4x4Jimmy
10-01-2004, 01:48 PM
I have checked just about everything mentioned. The only other thing mentioned that I would believe it could possibly be is the 2-4 Band not being held by the pin. Don't know how in the world it could have fallen off during assembly w/out me noticing, but I guess I'll have to check.

4x4Jimmy
10-09-2004, 06:41 PM
Found and fixed the problem. 350sBlazer was right. The 2-4 band wasn't on the accumulator anchor pin. The pin was just slidding right under the band. Problem Solved!