Have you had the fluid changed in the differential sometime in the past? If you put regular grease in a locking differential thats got clutches they'll get sticky on you.
Had that same type rear end in an earlier model GMC, but my problem was after many highway miles the rear would be locked up like a spool and would be hard to steer and chirp the rear tires on turns.
I changed the fluid and made sure it had the additive for "posi" units and had no more problems. You can also buy the posi additive (anti-foaming agent) by itself and add to your existing fluid. I suppose it is possible for the additives properties to be spent and need replenishing.
My experience with the GM locking rear end is that it is a good unit. I've had them in the last several trucks I've had and they've been reliable and work very very good. I wouldn't make any drastic moves before just trying the fluid change.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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