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He needed to change the fluid in it anyway, but thanks for the info for future id. I didn't watch him drain it to see if there was water in it, but it had been raining all day.
He wants to get a Detroit Locker. Someone at a 4 wheel parts store told him he would also need new bearings etc. I haven't ever heard anything about that. Can't you just stick it in without replacing anything else generally?
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If he goes with a Tractech Loc-Rite(a "drop in" locker), then he just install it without doing the bearings. If he gets a Detorit Locker, then it is best to replace the carrier bearings at the same time.
*EDIT* With the Detroit, you'll also have to set-up the ring and pinion again...