Fits: 2001 thru 2005 Chevy Silverado/GMC Sierra 2500HD/3500HD LB7/LLY Duramax Diesel

The Max-Flow High Performance Water Pump kit is designed specifically for high RPM and high horsepower applications, but works just as well in stock applications. When the engine is seeing high RPM's and you suddenly let off the throttle, the pressure in the cooling system can cause the heavy factory cast style impeller to break or spin on the shaft. A common "fix" for this is to weld the cast impeller to the shaft, however, this can still lead to the same result. By using a substantially lighter impeller, made of lightweight resin, this reduces the amount of inertia, making it MUCH less likely to spin on the shaft. Comes with everything you need for install, and is a direct bolt-on replacement. 

Features: 

• Direct bolt-on replacement
• Lightweight Resin Impeller

Includes:

• Max-Flow Water Pump Cover
• Max-Flow High Performance Water Pump
• Water Pump Install Kit and Hardware
• Optional Thermostats (Each option contains 2 Thermostats):
  • DmaxStore High Flow Thermostats
  • GM Thermostats: Opens at 185ºF & 180ºF
  • Mishimoto Hot Climate Thermostats: Opens at 174ºF and 180ºF
  • Mishimoto Cold Climate Thermostats: Opens at 185ºF and 191ºF
• Optional Flywheel Locking Tool
• Optional Harmonic Damper Bolt:
  • GM Harmonic Damper Bolt

DmaxStore Note:

• For high horsepower and race applications, we'd recommend using a water pump bypass kit to help with excess pressures in the cooling system.

Replaces Part #

• 251723, 252994, 252838, 19168888, 97228188