Alright, here's the deal, I have a D60 with a trac-lok and a 14bff with a detroit, both with 4.56 gears. I'm looking for an 87-91 K5 but since I live in Minnesota, all the trucks around here are rusted out, so I figured while I was waiting for one to come along I would start buying lift components. I'd like to run an ORD 4" shackle flip with 2"-3" springs in the rear and an extended shackle and 4" springs in the front. I read somewhere that factory D60 spring perches sit almost 1" further above the axleshaft centerline than factory 10 bolt spring perches. So, the truck would be lifted 6" in the front and 6"-7" in the rear. First off, are there any glaring flaws with this setup that I'm overlooking? I'd like to run 18x39.5" boggers, has anyone done a similar setup? (6" of lift and 39's I mean) I'm prepared to do a good bit of fender trimming so that's not a problem. There was someone who fit 39.5" TSL's with 4" of lift that looked pretty good. Also, if you're running a similar setup, what kind of backspacing are you running. I would appreciate pictures too if you have any. Sorry, this turned into kind of a long post but I'd appreciate opinions and help.