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I figured it was more common to find Danas under GMCs than Chevys, at least in the '66 and back trucks,(44s & 60s) as most,if not all of them stuck to the "GMC/leaf spring", "Chevy/Coil spring" set-up.
After that, seems you could special order leaf or coil under either one. My guess is GM was geared to mass- build 12-bolt stuff with the coil set-up, and GMC spec'd leaf set-ups to Dana, and that's what they built till '67, then they started sharing more stuff between the two lines of trucks. Until then, GMC was viewed as the "workhorse" of the two truck lines,and chevy was the "standard production", but evidently the market was calling for both trucks to be more versatile in their specs. so GM started to offer more options in common.
Maybe an early move to "consolidate" the two truck lines??
After all, look at the '73-present Chevys/GMCs. Same truck, just different badging! JMO!
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hardrock2
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