A defective thermostat can result in engine overheating and potential internal damage. Improve the reliability of your 5.9L cooling system with a Mishimoto Dodge 5.9L Cummins High-Temperature Thermostat! This thermostat is designed as a direct-fit replacement for your aged factory unit. The Mishimoto thermostat has a higher activation temperature (190 degrees Fahrenheit) compared to the factory thermostat (180 degrees Fahrenheit). The higher activation temperature restricts coolant flow longer to allow a quicker engine warm-up, making this thermostat ideal for use in cold climates. As with all our products, this thermostat includes the Mishimoto Lifetime Warranty, ensuring superior product quality and craftsmanship. High-Temperature Thermostat, fits Dodge 5.9L Cummins 1994-1998 1996 Dodge Ram 1500 Base 5.9 Liter 42RE, 1994-1995 Dodge Ram 1500 Base 5.9 Liter 42RH, 1994-1995 Dodge Ram 1500 Base 5.9 Liter 42RH, 1996 Dodge Ram 1500 Base 5.9 Liter 46RE, 1994-1995 Dodge Ram 1500 Base 5.9 Liter 46RH, 1994-1995 Dodge Ram 1500 Base 5.9 Liter 46RH, 1994-1996 Dodge Ram 1500 Base 5.9 Liter NV3500, 1994-1996 Dodge Ram 1500 Base 5.9 Liter NV3500, 1994-1996 Dodge Ram 1500 Base 5.9 Liter NV3500, 1994-1996 Dodge Ram 1500 Base 5.9 Liter NV4500, 1994-1996 Dodge Ram 1500 Base 5.9 Liter NV4500, 1994-1996 Dodge Ram 1500 Base 5.9 Liter NV4500, 1997-1998 Dodge Ram 1500 Laramie 5.9 Liter 42RE, 1997-1998 Dodge Ram 1500 Laramie 5.9 Liter 42RE, 1997-1998 Dodge Ram 1500 Laramie 5.9 Liter 46RE, 1997-1998 Dodge Ram 1500 Laramie 5.9 Liter 46RE, 1997-1998 Dodge Ram 1500 Laramie 5.9 Liter NV3500, 1997-1998 Dodge Ram 1500 Laramie 5.9 Liter NV3500, 1997-1998 Dodge Ram 1500 Laramie 5.9 Liter NV4500, 1997-1998 Dodge Ram 1500 Laramie 5.9 Liter NV4500, 1997-1998 Dodge Ram 1500 Sport 5.9 Liter 42RE, 1997-1998 Dodge Ram 1500 Sport 5.9 Liter 42RE, 1997-1998 Dodge Ram 1500 Sport 5.9 Liter 46RE, 1997-1998 Dodge Ram 1500 Sport 5.9 Liter 46RE, 1997-1998 Dodge Ram 1500 Sport 5.9 Liter NV3500, 1997-1998 Dodge Ram 1500 Sport 5.9 Liter NV3500, 1997-1998 Dodge Ram 1500 Sport 5.9 Liter NV4500, 1997-1998 Dodge Ram 1500 Sport 5.9 Liter NV4500, 1997-1998 Dodge Ram 1500 ST 5.9 Liter 42RE, 1997-1998 Dodge Ram 1500 ST 5.9 Liter 42RE, 1997-1998 Dodge Ram 1500 ST 5.9 Liter 46RE, 1997-1998 Dodge Ram 1500 ST 5.9 Liter 46RE, 1997-1998 Dodge Ram 1500 ST 5.9 Liter NV3500, 1997-1998 Dodge Ram 1500 ST 5.9 Liter NV3500, 1997-1998 Dodge Ram 1500 ST 5.9 Liter NV4500, 1997-1998 Dodge Ram 1500 ST 5.9 Liter NV4500, 1994-1998 Dodge Ram 2500 Base 5.9 Liter 46RE, 1994-1998 Dodge Ram 2500 Base 5.9 Liter 46RE, 1994-1998 Dodge Ram 2500 Base 5.9 Liter 46RE, 1994-1998 Dodge Ram 2500 Base 5.9 Liter 46RE, 1994-1998 Dodge Ram 2500 Base 5.9 Liter 46RE ...See Application Guide for Additional Fitments