Eaton 509423 Gear Set PAI 920156CROSS REFERENCE: 509423 2104 509423 2719 509423 APPLICATION: Eaton DS344 DS404 DS DA DD 344 404 405 454 Series Multiple Use Application. BRAND: PAI 920156 Eaton 509423 Gear Set PAI 920156. Aftermarket truck parts and truck repair parts. Supports differential gear engagement and maintains consistent drivetrain torque transfer. All components are proudly manufactured in the U. S. A. by PAI Industries Inc., an ISO9001 certified company with over 50 years