Yeah you can get away with doing some strange things when you consider the system as a whole - e.g. you might be creating vibrations but they could be cancelling vibrations from somewhere else. You can also do things like run a different uni angle front and rear when the phasing is different.
The centre joint being a CV is very handy as you can basically do anything with it to alter the front and rear angles to what you need and it doesn't matter, that's why I adapted it for the Torana.
I've seen some which are 30-whatever degrees phased forward from the other end and some that are roughly the same but behind too. Couldn't really say what model they come from by the time some of them reach my hands.
It's odd though because the VN-VS Commodores were known for having drive line vibrations.
You are correct though, phasing and angles influence the overall behaviour of the drive line. It is possible that Holden altered the phasing to make up for a poor uni-angle at the diff. This does not make much sense though because the diff mounting (trailing arms) are a carry over from the VB-VL era where I don't think drive line vibrations were an issue.
If I get an opportunity I will pull the drive shaft out of our old VS which did seem to suffer from drive line vibrations although they didn't always occur consistently?
my vp one has a harmonic which sounds like 2 waves diffing in and out of phase once every half sec or so at exactly 98-100km/h ( peaks at 99 with waves being almost in phase, intervals slow right down to several sec apart). I never balanced it but its the only spot it has harmonics.
its set at 30-40 odd º
I'm the director of VSH (Vlad's Spec Holden), because HSV were doing it ass about.
I changed a crapped out centre bearing on mine when I slid the boot back I hadn't marked it and lined it all up and half fell off the bench and popper all the ball bearings out put it all back together didn't have a vibration on accel now but vibrated bad from 40-60km/h tried several different places some made it better some made it worse eventually gave up and sent it out for rephasing
I recall a few months back when I was looking for diff gears for mine that the gears are stamped with a 4 digit number, like 0578 or something like that which told you if it was vn-vs or later
No matter what the question is, the answer is always more horsepower!
