Cummins ISX 3681143 Timing Gear PAI 172038CROSS REFERENCE: 3680548 3681143 APPLICATION: Cummins ISX Multiple Use Application. BRAND: PAI 172038 Cummins ISX 3681143 Timing Gear PAI 172038. Aftermarket parts and truck parts. Supports gear rotation and maintains consistent timing performance. All components are proudly manufactured in the U. S. A. by PAI Industries Inc., an ISO9001 certified company with over 50 years of experience in the heavy duty truck parts industry. This part is built brand