Straight from Jeffro600's link...
A possible negative to the 8.8" is its c-clip axle design, which means (like the Dana 35) that the axle is held in place by c-clips at the differential, not by an outer axle flange. If your axle breaks, your wheel will come off! The Dana 44, in contrast, does not use a c-clip, so you're not completely stuck by a broken axle, but it's not a full-floating axle, either. A semi-floating axle, like the 44, can be driven a little way if broken, but not far. If there's a chance you'll break an axle, no matter which design, you should carry spares.