ACDelco 12478084 Transfer Case Oil Pump for NP261/NP263 HD & XHD

The ACDelco 12478084 is a genuine GM transfer case oil pump designed for New Process (New Venture) NP261 and NP263 heavy-duty and extra-heavy-duty transfer cases. This critical component ensures proper lubrication of internal transfer case components, protecting against premature wear and catastrophic failure.

Key Features:

• Gerotor-type pump design driven directly off the mainshaft
• Provides pressurized lubrication to critical internal components
• Direct replacement for GM Original Equipment part 12478084
• Manufactured to rigorous GM engineering standards
• Designed specifically for NP261HD, NP261XHD, NP263HD, and NP263XHD transfer cases

Function & Importance:

This oil pump is driven continuously by the transfer case mainshaft and delivers pressurized fluid throughout the transfer case assembly, including to the drive shaft thrust bearing and chain drive components. Proper oil pump operation is essential for transfer case longevity, as pump failure or low fluid levels can lead to oil starvation and expensive internal damage.

Quality & Construction:

As a GM Genuine Part, this pump is designed, engineered, and tested to the same specifications as the original equipment installed in Chevrolet, GMC, and Cadillac vehicles. ACDelco parts meet rigorous quality standards and incorporate the latest materials and manufacturing technologies from General Motors.