[GlennL]

I ended up mod'ing the stock crossmember.
I extended it up to give 4" more clearance than stock.
Then my driveshaft didn't clear the bottom of the cab. I had to notch the square brace (think it was there for support of the tank?) that runs along the bottom of the cab. Anyway, notched it up to the floor of the cab and then cut the back wall of the cab to match. Used a 5" hole saw for this. Clamped a 10"x10" section of plywood in place that had a 5" hole in it to use to locate the saw. worked perfect.
Got about 3 fingers room @ static ride height. Hits the bump stops before it hits the cab.
No issues @ full droop. Not even close to contacting.
Did all this w/the cab and bed (no floor) in place.