Originally Posted by tremiles
It's unlikely that the differential is the same in a solid rear axle as in an IRS because of packaging. And the 7.5 inch 10 bolt in the 4th gen did tend to crap out with not much more than stock power or drag radials hooking up
The diff has nothing to do with solid rear axles or not. There are several examples out there of diff's that work in IRS and solid axles. The tru-trac being one.