auto 4x4 hub making teeth noises

[Fast68Chevy]

uhm, i was driving my stepdads 82 K10 earlier today to go get stuff at store for exhaust work we are doing on a 94 grand Am and the left front hub started making horrible teeth grinding noises for about 1/4 mile at about 45 mph, freaked me out thought something bad was gonna happen to hub, so I slowed up til i could turn off and by that time it quit doing it, before it quit doing that i had made it to a stoplight ot take a left and after i got around corner and was coasting to turn off again and pull in a lot, i hear two thunks up there and thats it, no more nothing after that, i pulle dover and looked at hub and all looks fine, So i oput the truck in 4 HI and drove on that for about 2 miles and then when I got to other store i put it back in 2hi, and it was fine after then too. Ideas ? be worried ? its an NP208 truck with autolok hubs

thanks

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-71/C-10(thx teeitup and crews!)350 4+4/CH465(thx 71Chev, GMCPaul, and CPNE)longfleet bed(thnx meathead95)!still building it-
-'84 Z28(Z28) 1G1AP87GXEL100000 with H.O. 305/4bbl/190net/hp(L69) 3.73 rear(GT4/YC4) 700R4(MD8-MXO) & other goodies
-79 G20 pass van, 350/th350/10bolt,
paint is overrated
Randy- Lincoln, IL

r68c30@hotmail.com
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