ok, i am back from driving all over town looking at 14 bolt rear ends from what the salvage yard claims are mid 70's 20 series 3/4 ton trucks. I found one 3/4 ton, but the shock mounts are on the opposite side of my current setup(12 bolt). I thought that 3/4 tons are on the same side? Also, is the spring perch gap between the 3/4 ton and 1 ton several inches difference(more that 1-2")? Please help...rented a van to haul what I thought was a find, but the first p.o.s. that i saw was a mess and had shock mounts on both sides.... need some guidance from the "been through it" experts!