From Tamiya:
Used in place of the kit standard gear differential, this product is particularly useful on the rear, giving stable grip. Holes for the 3mm balls are designed to help keep them well greased. Contains 39T ring gear, bevel pinion gears, diff joints, balls, plus 850 and 1280 size ball bearings. The image at right shows an assembled example.
Set includes differential joint A, differential joint B, joint cup, ball differential ring gear (39T), bevel pinion gear (for 39T), 3mm 1/16 inch steel ball, 850/1280 bearing, etc.
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