I have a heavily trussed 14 bolt rear end for sale.
It has 4:10 gears (welded carrier - done right), bolt on disk brakes (all NEW parts - rotors, calipers, pads, brackets, etc...) and a 1410 yoke (machined for u-bolts instead of straps).
I built a HD axle truss over the top tied into a Poison Spyder Customs rock ring. It is set up for 4 link and coil-overs right now (all 1/4" brackets), but I would convert it to work with leaf springs for just the cost of the spring perches.