How to pancake front crossmember?

[PBFAB.COM]

Originally Posted by roofingbloke

Post for nathan,

If i was to go for your dropmember V3.2 for $999,

? does this use my stock upper and lower A arms & what steering rack is used + cost involved etc

The factory UPPER control arms from 63-87 are compatible and the factory LOWER control arms from 73-87 C10s are compatible.

63-72 lower control arms are NOT compatible... and here is the long story why: Originally we had the Dropmember designed with a large billet clamp that allowed the factory cross-shaft to be clamped in place on the crossmember. This allowed the use of 63-72 arms to fit after some trimming to the arms. It was necessary to trim them at the edge of the stampings close to the bushing ends. It was enough trimming, and close enough to the edge of the arm to where I felt it was better to stick with the 73-87 lowers, as they are a different stamping and there was NO need to trim them to fit. Since I decided it better and safer to stay with the 73-87 arms, I was able to change the shaft design to what it is today. No more billet clamps, and a safer way to run factory arms.