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Few questions on a 700r4

84CUCV

84CUCV

3/4 ton status
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Truck is a 91 k5 with a 5.7L. For some reason when i am doing about 60 or so. the 700 seams to drop back to 3rd a lot. I dont drive fast if that matters. At 60 i thought it would stay in 4th. Even if i tap the gas a little drops to 3rd. I know very little about this trans. my other trucks are 400s and no computer. SO could it be something with the TC? As always any help would be great. thx!!
 
Sounds like a place to start. if its not rightis it still ok to drive? thx
 
Maybe or maybe not. I am still learning about the TV setup. Depending on the way it is adjusted it could be ok to drive or it could burn it up quickly.
 
TV cable MUST be set right. But are you sure it's shifting and it's not just the TCC unlocking? When it does it, shift down to D. If it changes down then it was just your TCC unlocking.
 
there is a cluch on the tc? can you tell me a bit more? i know very little about 700s. thx
 
84CUCV said:
there is a cluch on the tc? can you tell me a bit more? i know very little about 700s. thx
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That is basicly what a torque converter is, a clutch. It continually slips unless of course you have a lock up TC. Once it is locked up it no longer slips. This is usually done at cruising speeds, it is automatic.

If what you are feeling is the TC locking and unlocking that is normal. The next time you are cruising and the trans "shifts" pull it down into drive and see if the RPMs change or stay the same. If they stay the same the the trans did kick down to drive. If they increase then what you felt was the TC unlocking which is normal.
 
All stock 91 k5. 32" tires. thats it. dont see how that could change anything,
 
in my 83 with the 6.2 and 700 it would do just about the same thing... it downshifted very easily from 4th... i have 33s and stock gearing and axles... i also just burnt up my 700 and am working on a rebuild. im not sure if they were related or not but i would definitively check your TV cable adj.
 
MA87K5 said:
I believe that if you change your tire size and/or gear ratio you need to adjust your TV cable to compensate.
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NO!! Never 'adjust' your TV cable. It needs to be 'set' to a pricise value for the throttle valve to work properly. It nothing like the old 3 speed kick down cables.
 
84CUCV said:
If you cant adjust the cable how do you know its right then?
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It's set to a certain value, not adjusted as such. Go to www.tvmadeez.com and read the article 101 (tab at top of page.) It's interesting stuff plus it tells you how to set the cable. Because the cable is the only link to the engine it controls line pressure and helps to command shifts. There is no vacuum lines on a 700. The gearbox 'needs to know' where the throttle is exactly to work out what to do where as a 350 would have a vacuum signal to aid it. The governer is only part of the shifting equation.
 
84CUCV said:
If you cant adjust the cable how do you know its right then?
Click to expand...

Yup, Mark's on the money...

This has come up a quite a bit in here... I've said it before too, I'm definitely not a fan of the "move it a few clicks and drive it" thought process on this one..

It is truly a "set it" not "adjust it" scenario... I know it can be a bit of a confusing read, but everyone with a 700r4 should go over Mark's link a couple times..

It's a simple process that takes 5 minutes... Release the D button or whatever retention method your cable uses, slide the cable all the way towards the firewall, release button, give full throttle, it'll click a few clicks out... done..
 
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