[Aussie Mike]

I think Dave is refering to making sure you have enough plunge in your axles. As the arms move up and down in their different arcs the axle will need to slide back and forth in the CV so that nothing binds up. If the axle bottoms out in the CV it might break it.

This is something I've been struggling with on my new rear end. I've made new drive flanges to gain the required clearance but it's still tight. Depending on how much negative camber I want to add to the rear I might have to machine up one slightly shorter axle. That'll be another fun project down the track.

Cheers