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 - On the Road with Dave Gohl: Tractors and Farming - by Dave Gohl. I never thought I'd live to see the day, when I could call myself a farmer. What allows me to say this? Well, when our family moved to our 20 acre site near New Prague, Minnesota, I had one thought in mind. You guessed it, farm it somehow. A little history is in order. In my younger days, mom, dad and my brother made frequent visits to dad's youngest brother Pete, who took over the home farm from grandpa MIke. It was the typical set-up, milk cows, pigs & chickens. In the winter, we'd play
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