I was just reading through this trend on rebuilding the disconnect, I had/still have a noise on the front end which kinda directed me to the disconnect so I stripped everything down to find this was not the problem although I did rebuild the unit with new needle roller bearings, seals and synthetic grease. My trailblazer has done 375,000km and the inside of the unit was OK but the ghrease was shot, all hard and discoloured, not from moisture just from wear and tear, the GM dealer tried to tell me there was the same oil in the disconnect as the differential, this is of course not true, I replaced the 3 bearings and seals for less than $70, including the grease.......my next challenge is the differential.......................has anyone removed and stripped down and rebuilt the diff, if so what parts did you need and how much, I can get a used one from a wreckers with no warranty for $550 cdn......................help!!