Join Date: Nov 2010
Location: West Jefferson, Ohio
Pickup trucks had 6 lugs through the '70 model year. 2wd's got 5 lugs after that, but the 4x4's continued on with 6 lugs. 4x4's also had leaf springs, while the 2wd's usually had rear coils.
The half ton pickup rear axle was the truck version of the 12 bolt. Not sure when that started, but my dad's '66 C10 has one. The 12 bolt was used until the early '80s when it was replaced with the 8.5 10 bolt rear axle.
'69 Impala 4-door hardtop
'70 Impala Custom coupe