Thread: T700 TV cable - Holley
28-08-2011, 10:49 PM #1
T700 TV cable - Holley
Got a question for those who run a T700 with a Holley.
Alright, I have just o/hauled my T700. I have a brand new 4150 HP series 750DP. Brand new Holley brackets to adapt the cable to the Holley (Holley part #s 20-95 and 20-121).
I have the trans on the stand and the Holley/Manifold on the bench.
When I attach the cable to the brackets the inner cable ends up about 25-30mm too long. I have pulled the outer cable all the way back through the adjuster and it is still way too long.
I understand the principle of adjusting these cables as I did my apprenticeship for Holden in the VN-VS era. Problem is everything looks good at the trans end and the carby end.
It appears I have a stretched cable? Am I missing something? Has anyone come across this previously.
I can cut the end off the cable and use a cable clamp and everything appears to work fine?
Thanks for ya help.
03-09-2011, 07:01 PM #2
drop the pan.
install the short tv link buy it from sonnax you will never ever get a correct tv pressure with a t700r4 if you dont do it via a pressure gauge
just my $1.50 worth of input.
04-09-2011, 09:47 PM #3
- Join Date
- Jul 2009
- Sometimes Melbourne
Short TV link isn't going to get back 30 mm, you need to alter the bracket that holds the outer cable to suit you needs and get that 30 mm back.
Put a gauge on it and make sure as soon as the throttle is starting to open the pressure is rising.
If the cable is too loose or stretched as you say, it should be hanging on to its shifts badly and pressure will already be quite high.
05-09-2011, 12:08 PM #4
I researched the operation of this system heaps and found a really good write up on Bowtie Overdrives website.
I cut the end off the cable and used 2 x cable pinch clamps. I then set the cable to bottom the TV plunger into the bore at WOT. I do have a pressure gauge handy and will check it when the trans is installed. I have a Holden service manual that I "borrowed" when I did my time there which details line pressures in all gears etc..
05-09-2011, 06:00 PM #5
like how you say borrowed!11 second E85 bottle fed boat anchor
05-09-2011, 06:47 PM #6
Hey Fatts/HQ368. I know you 2 blokes are quite established with autos so I will direct another question at ya's. When I built this box I was sold a Transgo SK700-JR-B correction package. Part of this kit was to grind down one of the lands on the PR valve. Also the kit apparently requires the Copper flash ball NOT be re installed. Well the kit details where to put the other balls back in but says nothing about the CF checkball.
Does this mod negate the need for the ball? Am i right in assuming the PR valve mod will allow off idle pressure at all times, or am I completely off track? I understand what the ball achieves (in the case of cable breakage) and also read on several other forums some builders leave it out cos it can be problematicThanks,
06-09-2011, 06:16 PM #7
- Join Date
- Jul 2009
- Sometimes Melbourne
Grinding the land on the valve allows permanent line pressure into the converter circuit which inevitably becomes cooling oil and lubrication, critical to the rear planetary in particular. Late boxs already have this mod done from the factory so check and see if it has a flat already ground on it, nothing to do with leaving out the check ball.
I think the problem of leaving the checkball out you refer to is the builder forgetting to put it back in or so that they dont have to worry about setting the cable up properly, when the car returns to idle it may let the ball seat and cause high shifts and pressure from then on. The problem goes back to incorrect cable set up.
You can leave the copper flash ball out (check ball #10) although it does have an important function, if the cable were to break the ball would be able to seat leaving the transmission on high pressure to prevent damage as a result of driving with a broken cable. At the same time I have only ever seen a few cables break and usually for a good reason (incorrect geometry after modifications).
Regarding the junior kit, I am not really a fan as the Americans had a lot of problems with their box's that we dont see over here because ours had most of the factory upgraded parts and calibration done, dont get me wrong some of it is good but most of it is rubbish. All the stuff I do to 700's is pretty much to address the requirements of the individual. I do buy aftermarket parts to do this, not the box type kits for high performance transmissions.
07-09-2011, 08:57 AM #8
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