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Planetary ball bearing gearbox for genuine S-480 motors. Comes with press on 3. 2mm bore pinion. Output shaft diameter is 4mm. These gearbox's are very very smooth and quiet unlike other very similar looking units. Warning! Long can 400's with 2.3mm shaft use the S-400 gearbox.
Size:
OD of mounting flange: 1.08" (27.5mm) OD of main gearbox body 1.165" (29.6mm) Motor Mount Holes: 2 each - 3mm, 19mm on center Length of gearbox housing 1.25" (31.9mm) Overall Length W/Shaft 1.865 (52.2mm)
 "Planetary Gearbox 3.8:1 #480")