You have to grind a little off the LCA and the bump stop needs to come off.
I still haven't taken my bump stop off though, I may do it tommorow, it's just a PITA for me.
I love my spindles, they work!!! It's not really a "nice" piece, I think they are the same thing as the doetesh and fabcrap ones. I installed the fabtech on steven (dcvrp)'s truck and they are AWESOME to isntall and they fit perfect. But they drive the same as any other spindle.
The install was way better on the fabtech, but for the price...I say springtech.
08 Cummins Mega Cab, 7" on 37
02 Explorer Sport
08 Brute 750 on 29.5