need help with ekstensive controle arms on my 04 avalanche

so yea iam body droping my avy on 26s and i bought ekstensive controle arms and in order to run them you got to modify the drop spindle and then relocate the upper arm to on top of the frame. so i was wondering if any body else has done this on here and if they could help me out with what to do to the drop spindles and relocating the upper controle arms ?

I don't know for sure on your year truck, but I had to flip the lower ball joint taper so that it bolted from the bottom of the spindle, not the top. Also drilled out the tie rod end to accept a 3/4" bolt for the new heim joint setup.  I would call them direct  281-442-1050 And find out for sure 

ok yea i was wondering what i need to do to flip the ball joint taper on the spindle for the lower controle arm . how did you do yours

You reverse ream the spindle...snap on sells a tapered drill bit that works perfect to ream it out. Runs about $50 with a lifetime warranty.

ekstensive is also going to recomend you use a stock spindle.