The Alliant Power AP63563 is a new water pump for 2006–2016 GM Duramax applications. Alliant’s Engine Water Pump circulates coolant through the engine and cooling system.

Features & Benefits

• New Alliant Power Water Pump (Alliant P/N AP63563)
• Fit, form, and function tested to meet or exceed original-equipment standards (per Alliant Power)
• Direct replacement for 12637105 / 251-738 / 98031233
• Backed by Alliant Power’s 24-month, unlimited-mileage warranty

Application

• Chevrolet Silverado 3500 (2006)
• Chevrolet Express 2500 / Express 3500 / Silverado 2500 HD (2006–2016)
• GMC Savana 2500 / Savana 3500 / Sierra 2500 HD (2006–2016)
• GMC Sierra 3500 (2006)
• Chevrolet Silverado 3500 Classic / Silverado 2500 HD Classic (2007)
• Chevrolet Silverado 3500 HD (2007–2016)
• GMC Sierra 3500 Classic (2007)
• GMC Sierra 3500 HD (2007–2016)

Always verify fitment against your VIN, engine, and OE part number before ordering.

Cross-Reference / Replaces

• General Motors: 12637105, 251-738, 98031233, 97372515
• Alliant Power: AP63563

Warranty: Alliant Power’s standard warranty: 24 months with unlimited miles/hours on installed parts (Alliant Power warranty policy, rev. Aug 2025).