I know e36 control arms on an e30 messes up the geometry of the wheel, the wheel ends not being centered unless other things are changed.
So therefore I assume it would do the reverse to an e36. The reason why guys use e36 control arms on an e30 is for the 5-lug swap.
On another note,
E30 ball joints work and can be pressed into E36 M3 control arms.
E36 M3 ball joints aren't replaceable (there is no part#).
Non-ms are replaceable, but regardless what are you trying to achieve? I don't think it's worth the trouble, just replace it with what you have. (unless you have m3 control arms)
Ball Joints were a weak part on both cars......just consider it a wear item and change it.
Last edited by T.Dot_E30; 09-29-2011 at 02:57 PM.