USA Standard Gear ZTNP17949 Transfer Case Input Shaft Spline - NP231D 23

The USA Standard Gear ZTNP17949 is a precision-manufactured input shaft designed for New Process NP231D transfer cases. This critical drivetrain component serves as the connection point between the transmission output and the transfer case, transmitting power to enable four-wheel drive operation.

Key Specifications:

• 23 spline configuration for secure engagement
• 5 inches in length
• 1/2 inch bearing design
• Direct replacement for OEM New Process parts

USA Standard Gear manufactures premium transfer case components backed by extensive inventory and technical support. This input shaft is engineered to meet or exceed OEM specifications, making it ideal for transfer case rebuilds, repairs, or maintenance. Each component undergoes quality assurance testing to ensure reliable performance and proper fitment.

The input shaft plays a vital role in the transfer case's function, receiving rotational power from the transmission and directing it through the transfer case's chain-driven system to split power between front and rear axles when four-wheel drive is engaged.