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The GM 12611935 OE Smooth Idler Pulley is a high-quality replacement part for LML and L5P Duramax engines built between 2013 and 2023. This single pulley is designed to be used as one of the two main pulleys in the engine's accessory drive system.
- OE-quality replacement: Ensures a perfect fit and reliable performance
- Smooth operation: Reduces noise and vibration for a quieter ride
- Durable construction: Built to last with high-quality materials
- Easy installation: Includes a bolt for hassle-free replacement
This pulley will not work in the third position found on some trucks.

The GM 12611935 OE Smooth Idler Pulley is a high-quality replacement part for LML and L5P Duramax engines built between 2013 and 2023. This single pulley is designed to be used as one of the two main pulleys in the engine's accessory drive system.
- OE-quality replacement: Ensures a perfect fit and reliable performance
- Smooth operation: Reduces noise and vibration for a quieter ride
- Durable construction: Built to last with high-quality materials
- Easy installation: Includes a bolt for hassle-free replacement
This pulley will not work in the third position found on some trucks.