Thread: 350 turbo or 700R4

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Originally Posted by Southernboss84

what transmission is the best to use for hotrodin i have been told the 700R is good but has a lot of problems with it but i want overdrive so i can cruise on the highway without having a lot of high RPM s or would i be better runing the 350 turbo and not have any problems i have two transmissions i have a 700 R and i have a 350 lockup so guys let me know what would be the best transmission

Th eonly real issue with the 700 is the setting of the trans pressure. Old timers were familiar with a kick down cable and assumed this was the same but it isn't. Setting the cable and the geometry for throttle connection is crucial.

It's not hard now as a few companies have the setup dialed in so it's basically a bolt in and verify the pressure then your good to go! If I already owned the box, it's what I would run!

Do a google search for 700R4 settings, it's amazing what you'll find for help.

Originally Posted by 34_40

Th eonly real issue with the 700 is the setting of the trans pressure. Old timers were familiar with a kick down cable and assumed this was the same but it isn't. Setting the cable and the geometry for throttle connection is crucial.

It's not hard now as a few companies have the setup dialed in so it's basically a bolt in and verify the pressure then your good to go! If I already owned the box, it's what I would run!

Do a google search for 700R4 settings, it's amazing what you'll find for help.

You're absolutely right; the variable pressure valve body is the weak link in these 700 R4s. If the cable isnt adjusted correctly, you'll smoke the trans in a short time. TCI makes a constant pressure valve body that eliminates this problem. I put one in my 48 but do not have it on the road to test it yet.

Originally Posted by falconvan

You're absolutely right; the variable pressure valve body is the weak link in these 700 R4s. If the cable isnt adjusted correctly, you'll smoke the trans in a short time. TCI makes a constant pressure valve body that eliminates this problem. I put one in my 48 but do not have it on the road to test it yet.

The constant pressure valve body is an waste of money. The cable has one "setting" only and no "adjusments" in between.

Sure fire method: First thing is to determine if your throttle pedal pulls carb or throttle body bellcrank to WOT. Have someone step on the gas pedal to the floor and then try to pull manually by hand to see if the throttle will open up more. If this checks out, set the TV cable so that the bellcrank on the carb or throttle body pulls it exactly to max pull without stopping WOT from occurring. To check this, I like to pull the TV cable clip off the bellcrank, move the throttle to WOT, pull the TV cable frwd beside the clip where it hooks on and you will see immediately if its close.
Next is to make sure the plunger on the valve body is fully depressed when the gas pedal is floored. A visual of this with the pan off will help. The reason for this is that if you have a bad TV cable and its hanging up in the sheath, it will feel as though you have it set right but may not be actually burying the plunger in the valve body. (Ask me how I know this little nugget even though I had ordered a brand new aftermarket TV cable)

Setting the cable properly first is the key to a happy 700r4. The fear of this "setting" is making TCI some dough I guess.

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