Before you settle on any diff carrier you ought to take a hard look at this one, click here =>
Wavetrac. To my knowledge it is not made for a Dana 44, but it seems they make it for everything else.
Perhaps the easiest center section to use is the 8.8 Ford IRS and this unit will slide right in. There are no clutch packs and no preload. Everything is done with gears and the driving experience is like no other.
Ed