Thinking about bagging my crew cab looking for front bag setup pictures

[dragn91]

Thinking about bagging my crew cab c20. I need to know how much I need to section the front crossmembers to lay frame instead of control arms on a c20 should be the same as a c30 as the frames are the same height. My plan is to use drop spindles m.m.w dodger upper control arms and cupped l.c.a's with a sectioned crossmember. I just traded into a fully bagged civic that I'm going to part out so I basically got all the air management for free just need to buy bags since the civic is on cylinders. Here's my truck it's an 80 crew cab with a 73 stepside bed on 22 inch transport steelies. http://
Ignore the positive camber the previous owner has like and inch of shims on the upper control arms I still have to align it.

[bbbc10]

Section 1.5" out of the crossmember

[SCOTI]

A 1.5" sectioning allows the frame rails to hit the ground. The a-arm pivot points will be about 1" from making contact.

[dragn91]

Thanks I thought that was the number just wasn't sure. And that is right for c20/30's right? I know the c10s have a shorter frame than the 20s/30's so I figured it be different

[slotard]

The frame dimensions vary from year to year (or at least the section modulus according to GM Heritage Center pdfs varies), but it looks like all crew cab frames are 7.33. For some years single cab C20 and C30 frames have the same section modulus, for others they don't, and for all I know there are options not shown in the Vehicle Information Kits.