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B-112 differential problem

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My son's B-112 came to a lurching stop. I disassembled the differential to find that the center "sun gear" which is keyed to the axle was completely stripped off to the root of the gear (not one tooth left). All of the planetary gears are in good shape, the bolts are in good shape (not bent), but there is a little play between the bolts and the sleeves that the planetary gears ride on, although the play is not extreme. There appeared to be plenty of grease in the housing also. I found it wierd that only the one gear was damaged, while the center gear was so totally destroyed. Anyone have an idea on this one? Thanks.

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