Originally Posted by Dirt Claude
I've got a 4" lift which should give me a little flexibility.
don't forget to lower bump stops if needed. also think about lateral movement of the axle. I found that at least on my rig (heavy 60) the axle can move back and for the laterally 4" or more. First time I set it up I learned that after a week in Utah blasting around the desert. It took an oil level sensor out.
Also, not knowing your experience level (you probably know this stuff already, but mine ain't high) this may help. Roger Brown does a great job of explaining Driveline angles.