I noticed a recent thread (somewhere on the board that now I can't find) that mentioned they had gained some caster by milling .070" off the ball joint. Someone then asked what could be gained by this and also asked the distance between upper and lower ball joint at the A-Arm mounting centerlines. Got me curious so I took a rough measurement from my car.
The distance between upper and lower ball joints where the caster adjustments are made is approximately 12". If you do the trig, a .070" shift on upper and lower ball joint will gain you ~.7 degrees more caster. Someone also mentioned they thought milling an 1/8" off each ball joint was possible. This only results in an additional 1.2 degrees over max stock setting. To get the additional 3.6 degrees (and total >5 Deg), you do need to do the A-Arm mod and shift the top ball joint 3/4".
For those of you that have done the A-Arm mod, did it shift the wheel rearward in the wheel opening about 3/8"? -Seems like it should and might even help center the wheel in the wheel well opening of some cars.
Here are several related threads.
http://pantera.infopop.cc/eve/...562/m/4810078562/p/1
http://pantera.infopop.cc/eve/...0042044&m=9830021654
Kelly
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