jack it up and see if you can mimic the sound using the brakes and you should be able to tell if it's the slide locker or the axle . put it in 2wd and get it spinning and give a little brake . should be able to tell if its diff or cv by standing behind it while trying. the slide sleeve linkage needing adjustment is common but you sayings it doesit in bothand its quueter in turf points to an axle for me.
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