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Re: 70 GMC 4wd version
The spring perches on 2WD vs. 4WD are different. I think the 4WD perch width is like 40" where the 2WD is like 42 1/2" or something. I ran into this a while back on my 4wd build. As far as the pinion angle I measured mine while it was bolted up to the springs before I cut the perches off. Then I bolted the axle up with new perches, centered the axle, set the pinion angle, then welded them onto the axle. I bought a magnetic angle gauge from harbor freight and it works just fine.
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Zach
1970 Chevrolet Custom Camper K20
1971 GMC Super K2500, 12V/NV4500 swap in progress
1971 Chevrolet Custom C10
1972 Chevrolet Custom Deluxe C20, 5.3/4L60E
1972 Oldsmobile Cutlass Supreme, 455/TH400, 3.73 posi
2004 GMC Sierra 2500HD, LB7/Allison, CCSB
2005 GMC Sierra 1500, 5.3/4L60E, CCSB
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