This is a A-9843942 Shaft, Output PN: 9843942Main Description As Following : A-9843942 Shaft, Output P.N: 9843942 Model 8770: < 3-12-94 shaft was optl.; 3-13-94 > shaft was std.Dim A (1): 1000 RPMDim B (2): 1-3/8" Dia.Dim C (3): 21 Spline Found in Section & Models : PTO Parts > PTO and Related Parts, Ford / New Holland TRACTOR: 8670 (W/ 6 CYL, 9/93>), Ford / New Holland TRACTOR: 8670A (W/ 6 CYL, 2/01>), Ford / New Holland TRACTOR: 8770, Ford / New Holland TRACTOR: 8770A, Ford / New Holland TRACTOR: 8870, Ford / New Holland TRACTOR: 8870A, Ford / New Holland TRACTOR: 8970, Ford / New Holland TRACTOR: 8970A Associated Items : New Also This is An Aftermarket Product And : Model 8770: < 3-12-94 shaft was optl.; 3-13-94 > shaft was std. Dim A (1): 1000 RPM Dim B (2): 1-3/8" Dia. Dim C (3): 21 Spline