It's spring under, which is what I want, as I don't want more than 4" lift max, so a 4" lift spring in 47" variety should net me about 3" of lift which is what I want. I figure a 1" spacer would work just fine with my planned wheel and tire combo. And as for the 7/16 studs, I'm going to swap in a 14bsf in the rear with a disc brake swap and will probably punch the fronts out to accept the newer metric studs, or vice versa, we'll see. I did it on the replacement shaft on my 10-bolt as the shaft was actually for an older Chevy but otherwise worked. As for the flattop knuckles, since I'm going spring under I won't need them.
Actually, since I'm likely going to use a wheel spacer in front, I'll get a spacer with lugs that match the rear axle.
cent frum a smaert fone