Differential bad?

[AirSpeed]

I drove my 72 K1500 this morning and noticed a pulsing howl as I accelerated, once I was at speed it seemed to stop. On my way home going down hill I felt a sudden jerk like something momentarily bound up. I pulled over to check things out but could find nothing wrong. I drove about four more miles home and noticed the howling at lower speeds and as I decelerated. Could I have lost a tooth on one of the gears in the rear differential? I’m not feeling any vibrations or hearing any clunking sounds, just the howling sound. I don’t have time today so I’m going to pull the cover off tomorrow but thought I’d ask you guys if i should look elsewhere if I don’t find anything in the rear end.
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