Swapping differentials from an 89??

[jcfoote60]

I have a guy at work that has an 89 suburban 4x4 that he said has a burned up 700R4 and he just wants to get it out of his drive way. He says it's a heavy half ton and has a posi rear end that he just spend $1400.00 dollars on rebuilding (just before his tranny went out). Has anyone every swapped out their diffs with something of this model year? If so what things need to be done to make it work? Thanks for any advice

Jim