Good idea but the TJ Dana 44 is very expensive in the wrecking yards. You can easily build an 8.8" with gears, brackets and locker for what you'd pay (without a locker and probably not with the gears you need) for a TJ 44 in the wrecking yard.
As 1BLKJP, mentioned, the 9" has an extremely low pinion. The True high9 system is great for frontends but I'm not a fan in rear applications. The gear helix that makes the 9" so strong (yes, I know the additional pinion support makes it stronger too) makes it much weaker when run on the 'coast' side of the gear.