Description
Transfer case conversion kit engineered for 1973 to 1979 Ford, GM, and Dodge vehicles equipped with NP203 transfer cases converting full-time four wheel drive to part-time operation. Hubs not included.Mile Marker NP203 4×2 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.
- Converts NP203 from full-time to true part-time four wheel drive.
- Reduces front drivetrain wear and parasitic drag.
- Helps improve fuel efficiency and component longevity.
- Precision-machined components engineered for durability.
- Designed specifically for 1973 to 1979 Ford, GM, and Dodge NP203 systems.
Information:
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.
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 |
| 1977-1979 | Chevrolet K30 |
| 1973-1974 | Chevrolet K30 Pickup |
| 1975-1979 | Chevrolet K5 Blazer |
| 1974-1979 | Dodge Ramcharger |
| 1975-1977 | Dodge W100 |
| 1973-1974 | Dodge W100 Pickup |
| 1977-1979 | Dodge W150 |
| 1975-1979 | Dodge W200 |
| 1973-1974 | Dodge W200 Pickup |
| 1975-1979 | Dodge W300 |
| 1973-1974 | Dodge W300 Pickup |
| 1978-1979 | Ford Bronco |
| 1973-1979 | Ford F-100 |
| 1975-1979 | Ford F-150 |
| 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 |
| 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 |
| 1979 | GMC K2500 Suburban |
| 1977-1978 | GMC K35 |
| 1973-1974 | GMC K35/K3500 Pickup |
| 1979 | GMC K3500 |
| 1974-1979 | Plymouth Trailduster |
| Attributes | |
| Country of Origin (Primary) | TW |
| Finish | Natural |
| Harmonized Tariff Code (Schedule B) | 8483604040 |
| Hazardous Material Code | N |
| Life Cycle Status Code | Available to Order |
| Material | Combination, Combination |
| NAFTA Preference Criterion Code | D |
| SDR Required Flag | N |
| Series | Premium Series |
| Warranty Time | 1 |
| GTIN | 00758626005014 |
