I just exploded the carrier in my '94 1/2 ton suburban. It broke so bad (at 5 mph @ Hollister OHV with my race truck & trailer) that the axles slid right out! If it would have happened at speed I would have lost everything and probably killed somebody. I called Randy's ring and pinion, and they said it happens all the time and the stock 10 bolt carriers are junk.
I ordered OEM 4.10s, (was 3.42) and a true trac carrier and a rebuild kit for $630. Eaton carrier was a little more, but said the true trac was beefier and had smoother posi. He recommended the stock gears because they cool better and don't make any noise compared to aftermarket gears - plus the carrier is the weak link not the gears.
Don't know if I got screwed or not, but I'm clueless when it comes to late model chevys, and I need it fixed ASAP (Yerington's next weekend) so I went with it. Cheapest used or rebuilt stuff I found up here was $850!!! Lemme know if you're interested and I'll send you the guy's name & number I talked to yesterday.