This is a A-R51100 Shaft, PTO (1000 RPM) PN: R51100Main Description As Following : A-R51100 Shaft, PTO (1000 RPM) P.N: R51100 Dim A (1): 54.187" longDim B (2): 21/6 Splines Crossed From: AMR51100 , , WN-R51100 , , WNR51100 , Found in Section & Models : PTO Parts > PTO and Related Parts, John Deere TRACTOR: 4630 (SN <-6999 SYNCRO RANGE TRANS.) Associated Items : New Also A-FRM-JD, A-JD-O-OMR65495, A-JD-P-PC1296, A-JD-S-TM1172, A-SMJD50 And : Dim A (1): 54.187" long Dim B (2): 21/6 Splines