[Overdriven]

I think you'd notice tires being out of balance before you notice the shaft. I've done that before on a center shaft which spins faster and never noticed anything out of the ordinary.

For the a-arms, at ride height it may only barely hit, but at full droop (wheels off ground) you may need more clearance. I had to widen the stock dimple quite a bit (only slightly deeper) on mine because I was riding really high