Well a new output shaft seal is in and I am happy to say my transfercase is now leak free! I also put in a new centering yoke and ujoint. My drive in felt vibe free, but that damn noise is still persisting
. With the driveshaft out, I cannot hear the noise. I put the driveshaft in, jack up the rear and put it in gear and I cannot hear it. Rotation consistent with wheel speed. Axle bearings good shape, both diffs rebuilt, transfercase has fresh fluid and new chain, new ujoints and centering ball in drivehsaft. Happens in 2wd and 4wd. I am stumped at this point.