OK, so two weekends ago replaced both upper and lower ball joints on the drivers side of my 02 2500HD. no idea if it has any connection to current problem. i have always had moisture on the 6 bolt axle flanges but today drove to work and came out at lunch and there was a roughly 6inch across puddle of gear oil under the passenger side axle flange. and it is dripping from the flange about once every 25sec's. i had looked and found a few write ups but nothing to in depth. i have found so far that i need to remove the whole passenger side axle tube, then remove the inner axle from the tube to rip out the old seal. now is there a seal on both ends of the axle tube one right next to the 6 bolt flange connected to the cv shaft and one on the differential side that i should replace while i have the axle tube out of the truck? well thank you for your help and i will continue to search for more info on this before i try to get it done this weekend.