What's the best year for the one ton Chevy 4x4 that I want as a donor rig for my '77 K5. I'm just trying to find out what's the best year? I know NP205s were pretty much the norm through the second half of the 70's to '91. When did Chevy switch from kingpin to balljoints on the D60s? What about the second generation 14 Bolt FF with additional ribbing on the housing? 700R4 Tranny? Talk to me folks. I want to buy a donor rig that will qualify as my parts department for my build.