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Turbo 350 Kickdown Cable

Started by _BrettLH253_ , Apr 28 2009 08:26 AM

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18 replies to this topic

#1 _BrettLH253_

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Posted 28 April 2009 - 08:26 AM

Hey All

The turbo 350 we purchased has had the kickdown cable chopped off. The trans does have a stage 2 shift kit so my question is, is it really worth worrying about the kickdown cable or shall I just leave it off? :blink:

Its in getting a new breather put in it now as the old pipe was missing and the hole was literally clogged with crap and painted over. No wonder it was spewing oil out the filler tube. Other than that the trans is in good nic.

Cheers

Brett

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#2 _cruiza_

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Posted 28 April 2009 - 08:55 AM

The kick down cable is there for a reason I always found it very useful to have the auto change down a cog or two when I put my foot down on the go pedal

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#3 arrimar

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Posted 28 April 2009 - 05:55 PM

I was told years ago to make sure it was fitted as it adjusted fluid pressures properly.
Would like to hear from someone with appropriate education on this too.

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#4 _ChevLX_77_

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Posted 28 April 2009 - 06:15 PM

I would only remove the kickdown cable if the box were full manual valvebody etc.

The kickdown cable does need to be adjusted porperly as does the shifter rod or cable

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#5 _HRV74_

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Posted 28 April 2009 - 09:06 PM

I was told years ago to make sure it was fitted as it adjusted fluid pressures properly.
Would like to hear from someone with appropriate education on this too.

Interesting stuff. I'm just about to get my TH700 converted to full a manual valvebody and, even then, the transmission expert is going to retain the kickdown cable, the reason stated was "fluid pressure" so there must be some truth to it.

Cheers, H

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#6 _BrettLH253_

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Posted 29 April 2009 - 07:58 AM

Well that surely added to the reason why it was spewing trans fluid out the filler then.

Cheers

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#7 warrenm

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Posted 29 April 2009 - 08:32 AM

The cable you refer to is called a Throttle Valve (TV)cable,in short it adjusts hydraulic pressure in relation to the throttle position, if adjust incorrectly the trans may slip or change erratic.
Warren

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#8 _@milco@_

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Posted 29 April 2009 - 01:23 PM

so i am guessing this system is in place instead of the vacume line?

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#9 _ChevLX_77_

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Posted 29 April 2009 - 06:21 PM

In a full manual valve body the modulator must be retained

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#10 _cruiza_

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Posted 29 April 2009 - 06:55 PM

so i am guessing this system is in place instead of the vacume line?

My limited understanding is you need both, vacum line for controlling gear changes in normal driving
and Kickdown cable for rapid gear changes when you stand on the gas

hopefully someone more knowleglable will correct the above using all the right words and spelling

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#11 LXCHEV

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Posted 29 April 2009 - 08:49 PM

I've never connected the kickdown cable on my T350 behind the Chev. And I've never had any issues not running it. My trans is not manualised, it's standard, but shift-kitted. If I need to, I just pull it back from Top to 2nd manually, but rarely even need to do that. I still run the vacuum line of course.

PS. Has been this way for many many years now.

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#12 _ass308_

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Posted 29 April 2009 - 09:59 PM

u can get away with no cable on a 350,but not a 700r4.

im lead to believe the only difference basicaly,between a 700r4,and a700460le is the computer.700460le gets its throttle

position from the computer,a turbo 700r4 needs the cable,for throttle position.this gives pump presure

i forget exactly why u dont need it for 350.although u dont need it it was still recomended to run it.and 350s can still kick down with vacum advance.a 700r4 has no vacum advance

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#13 Dr Terry

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Posted 30 April 2009 - 09:18 AM

u can get away with no cable on a 350,but not a 700r4.

im lead to believe the only difference basicaly,between a 700r4,and a700460le is the computer.700460le gets its throttle

position from the computer,a turbo 700r4 needs the cable,for throttle position.this gives pump presure

i forget exactly why u dont need it for 350.although u dont need it it was still recomended to run it.and 350s can still kick down with vacum advance.a 700r4 has no vacum advance

Yes, that's about it. I believe that on a TH350 the cable is for kickdown only & the vacuum modulator alone controls the pressure. If you disconnect the cable it will not effect upshifts or downshifts, except for the lack of full-throttle kickdown.

The TH700R4 (4L60) on the other hand has no vacuum modulator & relies totally on the cable for TV pressure. If you disconnect the cable on these boxes, they drive like a dog.

4L60-E (VR onwards) is fully electronic, with no cable or modulator.

Dr Terry.

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#14 LXCHEV

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Posted 30 April 2009 - 07:15 PM

Spot on guys. Now that I've read that, it's refreshed my memory.

I know a few guys running TH700R4's, and not only do you need to run the cable, but you also need to have it adjusted perfectly... otherwise it just causes grief! But once they're set right, they run like a dream. I'd still like to play with a tricked up 700R4 behind my Chev one day, but all the cars I've been in with them, just don't seem to shift as nice as the TH350.

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#15 _HRV74_

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Posted 02 May 2009 - 08:15 PM

Hi all
Looks like there is quite a few differences between the TH350 and the TH700R4.....apart from the extra cog!
I've heard that the TH350 is tougher, but I haven't broken my TH700R4 yet.....and the 4 speed is just magic on the highway.

Cheers
H

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#16 _ass308_

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Posted 03 May 2009 - 02:57 PM

im looking forward to highway magic,with my 700r4.

.

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#17 _HRV74_

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Posted 27 July 2009 - 09:02 PM

Spot on guys. Now that I've read that, it's refreshed my memory.

I know a few guys running TH700R4's, and not only do you need to run the cable, but you also need to have it adjusted perfectly... otherwise it just causes grief! But once they're set right, they run like a dream. I'd still like to play with a tricked up 700R4 behind my Chev one day, but all the cars I've been in with them, just don't seem to shift as nice as the TH350.

Does this depend on the type/brand of manual valve body that is being used? Have just had a TCI Full Manual Valve Body fitted (to my TH700R4) and the cable has been ditched. Car has run very well so far.
Cheers, H