Late as usual but…
1985 C10 swb as issued with Qjet on a 4.3, Th400, 4wd airdam, open 2.73s, P205/75r15 on 15x6 rally wheels got 14-16 town, up to 29 hwy. Swapped to P215/70r15s, 14-16 town, 24-26 hwy. Swapped to LT235/75r15D ATs, 11-13 town, 18-20 hwy.
1992 K1500 extended cab short bed, tbi...