Slow leak in the rear differential caused the pumpkin to dry up and destroy itself.

Every time I put my truck in 4 wheel drive it made a flunk sound and again when I took it out. Four months later while traveling 5 miles down a narrow driveway the rear end locked up. I crippled it to the main highway and got a tow. Took cover off rear end and the pin was broke in half, locker and gears had teeth broke off/ now gonna cost $2,300. for just the locker plus gears.