Mile Marker 501 - NP203 4x2 Conversion Kit Ford GM Dodge

Mile Marker 501 - NP203 4x2 Conversion Kit Ford GM Dodge

Mile Marker NP203 4x2 Conversion Kit is engineered to convert factory full-time New Process 203 transfer cases into part-time four wheel drive systems for improved efficiency and reduced drivetrain wear. Designed for 1973 to 1979 Ford, GM, and Dodge vehicles equipped with the NP203 transfer case, this kit eliminates constant front axle engagement while maintaining the strength and durability of the original transfer case. Full-time NP203 systems were originally designed to keep the front drivetrain engaged at all times, increasing component wear and reducing fuel efficiency.

The Mile Marker conversion kit replaces internal differential components, allowing the transfer case to operate in true part-time mode when paired with manual locking hubs. This reduces unnecessary front axle rotation, decreases wear on drivetrain components, and can improve fuel economy while preserving off-road capability when engaged. Engineered with precision-machined components and backed by decades of drivetrain experience, the NP203 conversion kit provides installers and restoration specialists with a proven solution for modernizing classic full-size trucks.

This version does not include locking hubs and is intended for use with compatible manual hub applications. Built for reliability, durability, and long-term performance, Mile Marker restores control to your drivetrain without compromising strength.

Features and Benefits:

• Converts NP203 from full-time to true part-time four wheel drive.
• Designed specifically for 1973 to 1979 Ford, GM, and Dodge NP203 systems.
• Helps improve fuel efficiency and component longevity.
• Precision-machined components engineered for durability.
• Reduces front drivetrain wear and parasitic drag.

Associated Comments:

• Designed to work with 1973 to 1979 Ford, GM, and Dodge vehicles equipped with New Process 203 transfer cases. Converts factory full-time four wheel drive systems to part-time operation. Manual locking hubs are required and sold separately. Verify transfer case model prior to installation.
• Engineered specifically for NP203 transfer case applications only. Requires compatible manual locking hubs for proper part-time operation. Professional installation recommended. Follow factory service manual procedures during transfer case disassembly and reassembly.

Details:

• Series: Premium Series
• Material: Combination
• Warranty: 1 Year