2wd 1990 suburban swap suspension with 82 truck?

[jesdude7789]

Would I be able to convert my blue 1/2 ton 1990 R1500 2wd suburban to a 3/4 ton without modifying anything if I bought all this truck's suspension?

http://austin.craigslist.org/pts/4712343590.html

My burb sags bad in the rear and I would rather just make it a 3/4 ton anyway if possible. How much would it raise the rear compared to the 1/2 ton stance?

The tie rods are overdue for a change and the sway bar is bent anyway so I would probably do the rear one weekend and the front on the next weekend.