Originally Posted by DLM2005
same IRS 3.0 bearing holders/lowered IRS pods - wonder if the front arms(old skool) need shimmed to achive proper height (I don't have this problem with my 12L4 (also has IRS lowered pods but has the new front end which I did machine to acheive the same exact side to side ride height. And if the old skool are different would it be better to shim rather than machine then because of the built in castor?
The old style front arms vary somewhat but most provide even axle height. Check the installed axle height before doing anything.
I wouldn't try to machine the front arms. Many have tried and it is difficult to do accurately (read: no one has done right it yet). BTW, the front arms have no caster built in, they are 0 deg.
If I read your original post correctly, you are measuring the the ride height at the front of the rear pod where the links attach? FWIW that measurement is off on most of my cars but it doesn't seem to affect the car. I check the ride height at the front and rear, and at the rear of the chassis plate.