This is a A-R43014 Pinion Gear, Used w/ A-R43016 Shaft PN: R43014Main Description As Following : A-R43014 Pinion Gear, Used w/ A-R43016 Shaft P.N: R43014 Dim A (1): 20 TeethDim B (2): 2.000" Wide Crossed From: AMR43014 , Found in Section & Models : Transmission & Rear Axle > Diff Planetary Carriers and Related Parts, John Deere TRACTOR: 4520, John Deere TRACTOR: 4620, John Deere TRACTOR: 4630 (SN <-12839), John Deere TRACTOR: 7020, John Deere TRACTOR: 7520 (1972-1975 / REAR AXLE ONLY) Associated Items : A-R43016 Also A-JD-O-OMR46935, A-SMJD203, A-JD-O-OMR48272, A-JD-P-PC1229, A-JD-S-TM1030, A-SMJD203, A-FRM-JD, A-JD-O-OMR65495, A-JD-P-PC1296, A-JD-S-TM1172, A-SMJD50, A-JD-O-OMR51902, A-JD-S-TM1053 And : Teeth: 20 Width: 2.000"