So got rear diff gear swap done, will do front asap. Installed genuine AAM 4.44 gear set, no pinion depth markings anywhere, was told by someone at AAM to use original pinion shim. Installed original shim as a base line and had horrible pattern, put together checked pattern and tore back down and changed shim 4 times. Finally wound up with an great pattern on drive side, coast side is a little toward toe side of gear but has full contact, did final assembly and filled with oil. Drove several short drives 6,13 and 30 miles with breaks in between and check for leaks and recheck oil level yesterday. Today drove 26 miles then almost 100 miles, can tell a real difference in the truck and mpg's are definently better .5-1 mpg. Absolutely no gear noise, mds is a lot more active, and holds in higher gear much better, had to accelerate pretty quick once and could tell a big difference. I will know a lot more after towing later this week, need to break in a little more first. All in all very happy with job and gear choice, also installed AAM finned aluminum cover, case temp this afternoon after driving almost 100 miles, was 126 ambient was 82.