Complete transfer case conversion kit engineered for 1973 to 1979 Ford and GM 1/2 ton vehicles equipped with NP203 transfer cases converting full-time four wheel drive to part-time operation. Includes Mile Marker 104 manual locking hubs.

---

Mile Marker NP203 4x2 Conversion Kit with 104 Premium Hubs delivers a complete solution for converting factory full-time New Process 203 transfer cases into efficient part-time four wheel drive systems. Designed for 1973 to 1979 Ford and GM 1/2 ton trucks equipped with the NP203 transfer case, this kit eliminates constant front axle engagement while preserving drivetrain strength and off-road capability. Factory NP203 systems were engineered for full-time operation, keeping the front drivetrain engaged at all times, increasing wear and reducing fuel efficiency. This conversion kit replaces internal differential components, allowing the transfer case to operate in true part-time mode when paired with manual locking hubs. Included Mile Marker 104 Premium manual locking hubs provide durable engagement and reliable front axle control, completing the system for proper operation. By disengaging the front drivetrain during normal driving, this kit reduces unnecessary component wear, decreases parasitic drag, and can improve fuel economy. Engineered with precision-machined components and backed by decades of drivetrain experience, this complete conversion package provides professional installers and restoration builders with a proven upgrade for classic full-size trucks. Built for long-term durability and dependable performance, Mile Marker restores control and efficiency to your drivetrain.

• Complete NP203 conversion system including 104 manual locking hubs.
• Converts full-time four wheel drive to true part-time operation.
• Reduces drivetrain wear and parasitic drag.
• Includes durable Mile Marker 104 Premium hubs.
• Improves efficiency while maintaining off-road capability.

---

Information:

Engineered specifically for NP203 transfer case applications in 1/2 ton Ford and GM trucks. Professional installation recommended. Follow factory service manual procedures during transfer case disassembly and hub installation to ensure proper function and long-term reliability.

---

Application Summary:

Year	Make/Model
1973-1974	Chevrolet Blazer
1975-1979	Chevrolet K10
1973-1974	Chevrolet K10 Pickup
1973-1979	Chevrolet K10 Suburban
1975-1979	Chevrolet K20
1973-1974	Chevrolet K20 Pickup
1973-1979	Chevrolet K20 Suburban
1975-1979	Chevrolet K5 Blazer
1973-1979	Ford F-100
1975-1979	Ford F-150
1973-1979	Ford F-250
1973-1979	GMC Jimmy
1975-1978	GMC K15
1975-1978	GMC K15 Suburban
1973-1974	GMC K15/K1500 Pickup
1973-1974	GMC K15/K1500 Suburban
1979	GMC K1500 Suburban
1975-1978	GMC K25
1975-1978	GMC K25 Suburban
1973-1974	GMC K25/K2500 Pickup
1973-1974	GMC K25/K2500 Suburban
1979	GMC K2500 Suburban