QSB4.5 Cummins Flywheel Ring Gear 3901774 Parts Catalog Ref No. Part Name Part No. Required 　 4939064 Flywheel 1 1 4939063 Flywheel 1 2 3901774 Flywheel Ring Gear 1 Above is the introduction of the 3901774 Cummins Flywheel Ring Gear, while if you need Flywheel Ring Gear 3901774, complete Cummins engine or other Cummins product, please further consult our sales.