Buy Caterpillar 8N0939 - GEAR (crankshaft 64 teeth) at wholesale prices with easy payment and fast shipping options. Save up to 50% OFF OEM pricing. Compatible Machines:- ENGINE - MACHINE- WHEEL-TYPE LOADER Compatible Models:- 3408- 3408C- 3408E- 988B Units Containing The Spare Part :- 4N4302 REAR GEAR GROUP--Part 1 of 2 (3408)- 4N-4302 GEAR GP-REAR (3408)