Ken I would try the lube test to see if the sound changes with a thicker lube. If so then the usual places for the wine is the out put for the prop shafts (drive shafts). Two banana to take the t-case off. a 3-4 bannana to put new output bearing in it. best to have a press but can be done with out. If higher replace the big sealed bearing in the input area with a new one. But hey it is your money. later robbie