84-Elky
11-11-2010, 11:50 AM
With a new 700R4 that was not shifting properly, thought I’d weigh in on the TV Cable issue and share what solved my problems.
Have a TPI, so fortunately the proper throttle/TV Cable geometry required for the 700R4 was not an issue. The geometry issue is another subject. With a newly rebuilt trans and new Lokar TV cable, which was properly adjusted, my trans shifting was horrible, whether lightly or rapidly accelerating:
- way too quick & mushy 1-2 shift
-bad RPM flare, almost slipping, on the 2-3 shift
In no way am I trans expert; far from it. But invested $35 in a 300# pressure gauge from Bowtie Overdrives. Wasn’t looking forward to installing, and then uninstalling it, but glad I did it.
The pressure gauge showed that my properly adjusted TV cable was not even close. It needed to be pulled out approx 1/8” more before there was any pressure increase on the gauge (which is absolutely IMO what is required to have a properly set TV cable). I believe the reason a pressure gauge is required is because every trans is different primarily as to TV Spring tension, which is the main thing that sets the position of the TV Feed Valve relative to the TV Feed Orifice. The Valve and Orifice must be properly aligned so the slightest throttle movement off idle causes a pressure increase.
While everything on my car seemed tight and properly adjusted according to Lokar and all the TV cable adjustment procedures on this and other forums, my throttle could be opened rather considerably before getting a pressure rise – and this was on a car with everything virtually new with no wear.
So adjusted the TV Cable so there was an immediate pressure rise as soon as the throttle was opened ever so slightly from idle. Now, the 1-2 shift is as it should be and the 2-3 shift flare is totally gone.
Best $35 ever spent! Took 1 hr. start to finish. Probably saved me from trashing a trans. :smile:
Have a TPI, so fortunately the proper throttle/TV Cable geometry required for the 700R4 was not an issue. The geometry issue is another subject. With a newly rebuilt trans and new Lokar TV cable, which was properly adjusted, my trans shifting was horrible, whether lightly or rapidly accelerating:
- way too quick & mushy 1-2 shift
-bad RPM flare, almost slipping, on the 2-3 shift
In no way am I trans expert; far from it. But invested $35 in a 300# pressure gauge from Bowtie Overdrives. Wasn’t looking forward to installing, and then uninstalling it, but glad I did it.
The pressure gauge showed that my properly adjusted TV cable was not even close. It needed to be pulled out approx 1/8” more before there was any pressure increase on the gauge (which is absolutely IMO what is required to have a properly set TV cable). I believe the reason a pressure gauge is required is because every trans is different primarily as to TV Spring tension, which is the main thing that sets the position of the TV Feed Valve relative to the TV Feed Orifice. The Valve and Orifice must be properly aligned so the slightest throttle movement off idle causes a pressure increase.
While everything on my car seemed tight and properly adjusted according to Lokar and all the TV cable adjustment procedures on this and other forums, my throttle could be opened rather considerably before getting a pressure rise – and this was on a car with everything virtually new with no wear.
So adjusted the TV Cable so there was an immediate pressure rise as soon as the throttle was opened ever so slightly from idle. Now, the 1-2 shift is as it should be and the 2-3 shift flare is totally gone.
Best $35 ever spent! Took 1 hr. start to finish. Probably saved me from trashing a trans. :smile: