Sinister Diesel 2001-2005 Duramax, “Welded” Water Pump – SD-WWP-01


Product Highlights:

Proper heat management from the cooling system is crucial on modified engines when you want trouble-free and reliable performance. The factory Duramax water pump is known to slip under load and can serious problems and serious repair bills on modified high-horsepower applications. This updated design is a drop-in replacement for the factory water pump and uses precision TIG welds to secure both the impeller and pump gear to the shaft. If your 2001-2005 Duramax powered truck is running a tuner, a bigger turbo, or bigger injectors, or if it’s just time for routine maintenance, get peace of mind with the Sinister Diesel Welded Duramax Water Pump.

Vehicle Fitment

2001-2005 Duramax LB7 / LLY

Key Features

  • TIG welded on both Impeller and Gear for high strength and slip-free operation
  • Drop-in replacement for LB7/LLY factory water pump
  • Meets or exceeds OEM specifications


  • Sinister Diesel “Welded” Water Pump
  • O-Ring
  • Thermostat Gasket

*Special Order. Please allow for additional shipping time.