Late model rear end

Did some research and the explorer rear ends are a little bit longer but indeed are 8.8" (replaces the 9") I found one out of a 1997 with 60k, is a posi (locker) with 3.73 gears, disc brakes and 5 on 4.5" bolt pattern, for $175.00. The only thing I can see having problems with is the drive shaft other than that Is there any reason I wouldn't want to do this? an 8.75 out of a mopar with drum brakes is going to run me over $500.00 and probably still need some work.