This is a A-R59641 Pinion, Low Range Synchro Transmission PN: R59641Main Description As Following : A-R59641 Pinion, Low Range Synchro Transmission P.N: R59641 Dim A (1): 24 TeethDim B (2): 14 Teeth Crossed From: AMR59641 , , WN-R59641 , , WNR59641 , Found in Section & Models : Transmission & Rear Axle > Trans Related Parts, John Deere TRACTOR: 4000 (W/ SYNCHRO RANGE TRANS), John Deere TRACTOR: 4020 (W/ SYNCHRO RANGE TRANS), John Deere TRACTOR: 4230 (W/ SYNCHRO RANGE TRANS) Associated Items : New Also A-JD-O-OMR46934, A-JD-O-OMR48273, A-JD-P-PC1116, A-JD-S-TM1006, A-SMJD203, A-FRM-JD, A-JD-O-OMR34410, A-JD-O-OMR41754, A-JD-O-OMR46934, A-JD-O-OMR48273, A-JD-P-PC1116, A-JD-P-PC859, A-JD-S-SM2039, A-JD-S-TM1006, A-MW-OP-JD4010, A-MW-S-TURBO, A-SMJD203, A-FRM-JD, A-JD-O-OMR65347, A-JD-S-TM1056 And : Dim A (1): 24 Teeth Dim B (2): 14 Teeth