This is a A-396420R91 Flywheel w/ 396421R1 Ring Gear PN: 396420R91Main Description As Following : A-396420R91 Flywheel w/ 396421R1 Ring Gear P.N: 396420R91 Dim A (1): 133 Teeth Ring Gear Found in Section & Models : Engine Parts > Flywheels and Ring Gears, Case-IH TRACTOR: 656 (Gear Drive W/ C-263 Gas Engine.), Case-IH TRACTOR: 666 (Gear Drive W/ C-291 Gas Engine.), Case-IH TRACTOR: 686 (Gear Drive W/ C-291 Gas Engine.) Associated Items : New Also A-FRM-IHOL, A-IH-C-MUSCLES, A-IH-O-BATTIGN, A-IH-O-656, A-IH-P-ENG56CYL, A-IH-P-ENG6CYLG, A-IH-P-6562656, A-IH-S-CARBSPEC, A-IH-S-ELECDIA, A-IH-S-ENG460ETC, A-IH-S-ENG6CYLG, A-IH-S-HYDROTRN, A-IH-S-TOOLSLATE, A-IH-S-TUNELATE, A-IH-S-TUNEUP, A-IH-S-656CHASIS, A-SMIH202, A-IH-O-666, A-IH-P-ENG56CYL, A-IH-P-ENG6CYLG And : Dim A (1): 133 Teeth Ring Gear