What's the diff.....??

[b454rat]

I have an 88 K3500, but it does have the full float rear, Dana 70 not the 14ff. I've seen a bunch of 3500s with the 8 lug semi, but were all 2wd. I do believe that any truck that came stock with a 454 would have a full floater, not the semi. I've seen 2wd pampered street trucks with the semi grenade...

I think the 6 lug semi's all had the same breaks, so pick a year and try it. Or pull the cover and see what the rear gear says...