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Old 09-21-2008, 06:02 PM
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700r4 problems

I have a 700r4 out of a 92 chevy caprice police car had it rebuilt about 4 years ago and a had out put shaft put in it to adapt it to a transfer case. I put it in a truck a few days ago and it goes into reverse perfect and in 1st and 2nd gear good but in od and drive it wont hardly pull I have to give it a lot of gas to get it to move.

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Old 09-21-2008, 09:33 PM
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First, welcome to Hotrodders.com

A few things to check:

Trans fluid level. Does it smell burnt and look brown, not red?
Is TV (sometimes mistakenly called kick-down) cable hooked up?
How many miles since the rebuild?
Does it have a higher stall torque converter?

It may be clutch slippage you are feeling, if so the 3-4 clutch would be the culprit.
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High-perf Z-pak 3-4 clutch in a TH700R4:

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Old 09-21-2008, 10:11 PM
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it has 0 miles on it, and the cable is hooked up it has sit for about 4 years and now ive decided to use it
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Old 09-21-2008, 10:41 PM
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Are you saying the truck will not move forward till the shifter is in "1st" gear manually with the shifter? The truck will not move with the shifter in "OD" or "D" shifter position?

Then you move the shifter to "2nd" gear and the trans will upshift?
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Old 09-21-2008, 11:12 PM
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The TV cable needs not only to be "hooked-up", it is of PARAMOUNT IMPORTANCE that it is properly adjusted, -as it regulates shift feel, shift timing, and most importantly the operating pressures- upon which all operating functions in a 700r4 (also 200-4r) are based. It is possible to burn up the 3-4 clutchpack in short order if internal operating pressures aren't correct. I'm not great with transferring/posting links but can suggest you go to the "Knowledge base" section of this site and do a search for "TV Cable adjustment" or "700R4 TV Cable" and you'll certainly get the instructions you need to properly check and adjust. Also the cable geometry at the carb linkage is critical as well, so that the adjustment of the cable will be correct. Others on this forum might post some additional help as well, so check back. Good luck and hope it's an easy fix for you.-Jim
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Old 09-21-2008, 11:22 PM
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Some illustrations.
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Old 09-22-2008, 12:40 AM
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Hi,
Here's a good link for TV adjustment.
Rich

http://www.tvmadeez.com/article/index.html
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Old 09-24-2008, 07:11 PM
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i tried to adjust the tv cable multiple times with same results i could feel it shift sooner or later depending on how tight the cable is, so with the engine running i pulled the tv cable almost all the way before it would shift for the 1st time and the only time it shifts.
it still wont hardly pull in 3rd or 4th gear but pulls great in 1st 2nd and reverse

Last edited by machminer; 09-24-2008 at 07:40 PM.
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Old 09-24-2008, 08:53 PM
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You're full of fluid, right? Is fliud still red and not burnt smelling?

There is evidence that the TV valve isn't stuck.

Was your rebuilder an experienced auto trans builder?

If things are new and assembled properly, we probably wouldn't be here now, eh?

Another easy thing to look at is the governor. Check for debris and a worn gear. There is an inner valve- it should move just by gravity itself.

Unless you have a 0-300 pressure gauge handy, you are going to need to limp that thing to a trans shop for a pressure check.

Neutral/park 55-75 psi
Low/D2 160-190
Drive 55-75
Reverse 85-140

It gets more difficult now.

It's entirely possible that the builder cut a lip seal during the input drum assembly. Pinched some shaft sealing rings and the like.

Or a missing/cut 3-4 accumulator seal, bad bore etc.
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Old 09-25-2008, 08:57 PM
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anything is possible after having to pull the tv cable out all the way to get it to shift the first time. i kinda thought it might be a pressure problem, maybe a seal or oring or a valve stuckfailed because it sat so long (almost 4 years) when it was built my friend ran it on a dyno but it was takn apart again to put an output shaft in. i was told I could remove the valve body and soak it in laquer thinner and it would take off any tarnish and free up the valves?? is that true..

Last edited by machminer; 09-26-2008 at 05:33 PM.
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Old 09-30-2008, 05:21 AM
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guess nobody knows
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Old 09-30-2008, 07:52 AM
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Quote:
Originally Posted by machminer
guess nobody knows

you were given a guide for pressure tests on this unit. it appears you did nothing.

Find some trans knowledgeable person to help you is the best advice I can offer since you are not taking the advice offered by the members here.

The 3 - 4 clutches in the 700r4 trans have been a problem since the trans was introduced. I suggest a full tear down of this trans to find the problem and repair it.

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