a dana 44 is a light fullsize truck axle usually used in front axles on 4x4's. the newer style jeep ones use the smaller size outer axle tubes and a shortened width, but the center section on axle size is still the same.

the titan/xterra rear D44 uses the proper thick fullsize truck outer axle tubes and a little bit higher spline count axles for strength. the titans have had trouble towing with these and the newest ones have had differential improvements. It's a good sized axle for an SUV, but questionable for a 1/2 ton truck that tows. even the chevy 10 bolt is a little larger and those go out if you tow too much as well. the titan one looks to be improved internally which is good, but it would be better to use something else.

the dana 44 is a good sized jeep axle and parts are abundant. the xterra one reminds me of fullsized wagoneer or dodge front axles on old 4x4's. I wish they would put one on the front of the X..that would be the modern fullsize wagoneer for sure.