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As far as the spring perch put the axle in place under the truck withthe spring perch in place but not welded. Bolt up the u bolts snug not necessarily tight. Set the truck down on its own weight and check angles, adjust as needed. Weld perches. At least that would be my stab at it if I were to do it.
$65 for it, no disks or calipers or pads. They wanted an additional $90 for them and the rotors and pads were 100% garbage and the calipers were questionable so I left all that there and I'll just buy new and pay the core charge