Older 3/4 tons got the 14 bolt FF rear. All one tons got the 14 bolt rear and had the D60 front if they were newer than '77 and 4 wheel drive. Not to be negative, but they are pretty hard to find lying around in junkyards...there are a ton of people that know what they're looking at when they see it and the D60 fronts don't last long in the yards anymore.
"5.something" and 38's on the freeway. Two questions...do you have overdrive, and how fast do you want to go?
Rene