AR48294 Flywheel Fits John Deere 4320 TractorOne New Aftermarket Replacement Flywheel with Ring Gear Fits John Deere 4320 Tractor This aftermarket replacement flywheel with ring gear is designed for the Fits John Deere 4320 row crop tractor, fitted with the 6. 6L six cylinder turbocharged diesel engine (400 500 series engine). The flywheel mounts to the rear of the crankshaft and serves as the mating surface for the clutch assembly, while the integrated ring gear engages the starter motor during