This is a A-A58778 Ring Gear, Flywheel PN: A58778Main Description As Following : A-A58778 Ring Gear, Flywheel P.N: A58778 Inside Diameter: 15.880"Outside Diameter: 17.547"Teeth: 139Width: .880" Found in Section & Models : Engine Parts > Flywheels and Ring Gears, Case-IH TRACTOR: 1070, Case-IH TRACTOR: 1090, Case-IH TRACTOR: 1170, Case-IH TRACTOR: 1175, Case-IH TRACTOR: 1270, Case-IH TRACTOR: 1370, Case-IH TRACTOR: 1570, Case-IH TRACTOR: 770, Case-IH TRACTOR: 870, Case-IH TRACTOR: 970 Associated Items : New Also A-CA-O-1070L, A-CA-P-1070, A-CA-S-970TM, A-CA-S-9701070, A-SMC203, A-CA-S-1090ETC, A-SMC203, A-CA-P-1170, A-CA-S-1090ETC, A-SMC203, A-CA-O-1175M, A-CA-P-1175, A-CA-S-1090ETC, A-SMC203, A-CA-O-1270, A-CA-P-1270E, A-CA-S-12701370, A-MNL17573, A-SMC203, A-CA-O-1370LATE And : Inside Diameter: 15.880" Outside Diameter: 17.547" Teeth: 139