Mishimoto Dodge 5.9L/6.7L Cummins High-Temperature Thermostat

SKU: MISMMTS-RAM-99H

Thermostats, Mechanical

MM Thermostats

Mishimoto

Mishimoto Dodge 5.9L/6.7L Cummins High-Temperature Thermostat

SKU: MISMMTS-RAM-99H

Thermostats, Mechanical

MM Thermostats

IN STOCK! Est Ship 3-5 days. This item is IN STOCK at one of our warehouses or distribution centres, the ETA is the approximate time required to prepare your order for dispatch.

We accept

Description

A defective thermostat can result in engine overheating and potential internal damage. Improve the reliability of your 5.9L/6.7L cooling system with a Mishimoto Dodge 5.9L/6.7L 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 (205 degrees Fahrenheit) compared to the factory thermostat (190 degrees Fahrenheit for 99-10 and 2013 trucks and 200 degrees Fahrenheit for 10-12 trucks). 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.

Product Overview

1999-2001 Dodge Ram 1500 Laramie 5.9 Liter 42RE, 1999-2001 Dodge Ram 1500 Laramie 5.9 Liter 42RE, 1999-2001 Dodge Ram 1500 Laramie 5.9 Liter 42RE, 2003 Dodge Ram 1500 Laramie 5.9 Liter 45RFE, 1999-2001 Dodge Ram 1500 Laramie 5.9 Liter 46RE, 2003 Dodge Ram 1500 Laramie 5.9 Liter 46RE, 1999-2001 Dodge Ram 1500 Laramie 5.9 Liter 46RE, 2003 Dodge Ram 1500 Laramie 5.9 Liter 46RE, 1999-2001 Dodge Ram 1500 Laramie 5.9 Liter 46RE, 2003 Dodge Ram 1500 Laramie 5.9 Liter 46RE, 1999-2001 Dodge Ram 1500 Laramie 5.9 Liter 46RE, 2003 Dodge Ram 1500 Laramie 5.9 Liter 46RE, 1999-2001 Dodge Ram 1500 Laramie 5.9 Liter NV3500, 2003 Dodge Ram 1500 Laramie 5.9 Liter NV3500, 1999-2001 Dodge Ram 1500 Laramie 5.9 Liter NV3500, 2003 Dodge Ram 1500 Laramie 5.9 Liter NV3500, 1999-2001 Dodge Ram 1500 Laramie 5.9 Liter NV3500, 2003 Dodge Ram 1500 Laramie 5.9 Liter NV3500, 1999-2001 Dodge Ram 1500 Laramie 5.9 Liter NV3500, 2003 Dodge Ram 1500 Laramie 5.9 Liter NV3500, 1999-2001 Dodge Ram 1500 Laramie 5.9 Liter NV4500, 2003 Dodge Ram 1500 Laramie 5.9 Liter NV4500, 1999-2001 Dodge Ram 1500 Laramie 5.9 Liter NV4500, 2003 Dodge Ram 1500 Laramie 5.9 Liter NV4500, 1999-2001 Dodge Ram 1500 Laramie 5.9 Liter NV4500, 2003 Dodge Ram 1500 Laramie 5.9 Liter NV4500, 1999-2001 Dodge Ram 1500 Laramie 5.9 Liter NV4500, 2003 Dodge Ram 1500 Laramie 5.9 Liter NV4500, 2002-2003 Dodge Ram 1500 SLT 5.9 Liter 45RFE, 2002-2003 Dodge Ram 1500 SLT 5.9 Liter 45RFE, 2002-2003 Dodge Ram 1500 SLT 5.9 Liter 46RE, 2002-2003 Dodge Ram 1500 SLT 5.9 Liter 46RE, 2002-2003 Dodge Ram 1500 SLT 5.9 Liter NV3500, 2002-2003 Dodge Ram 1500 SLT 5.9 Liter NV3500, 2002-2003 Dodge Ram 1500 SLT 5.9 Liter NV4500, 2002-2003 Dodge Ram 1500 SLT 5.9 Liter NV4500, 1999-2001 Dodge Ram 1500 Sport 5.9 Liter 42RE, 1999-2001 Dodge Ram 1500 Sport 5.9 Liter 42RE, 1999-2001 Dodge Ram 1500 Sport 5.9 Liter 42RE, 1999-2001 Dodge Ram 1500 Sport 5.9 Liter 46RE, 1999-2001 Dodge Ram 1500 Sport 5.9 Liter 46RE ...See Application Guide for Additional Fitments

Product Details

Alternate Part Number:	MMTS-RAM-99H
Color:	Silver
Description:	Dodge 5.9L/6.7L Cummins High-Temperature Thermostat
Finish:	Raw
Install Difficulty:	N/A
Installation Difficulty:	2/5
Material:	Aluminum
Part Number:	misMMTS-RAM-99H
SellingPoint01:	Direct fit for 1999-2013 Dodge Ram with 5.9L/6.7L Cummins
SellingPoint02:	Restricts coolant system circulation for longer time to provide quicker warm up
SellingPoint03:	Ideal for cool climates
SellingPoint04:	Mishimoto Lifetime Warranty
SellingPoint05:	N/A
SellingPoint06:	N/A
SellingPoint07:	N/A
SellingPoint08:	N/A
SellingPoint09:	N/A
SellingPoint10:	N/A
SellingPoint11:	N/A
SellingPoint12:	N/A
SellingPoint13:	N/A
SellingPoint14:	N/A
SellingPoint15:	N/A
TechSpec Applications:	1999-2007 Dodge Ram 2500 w/ 5.9L Cummins Engine--1999-2007 Dodge Ram 3500 w/ 5.9L Cummins Engine--2007.5-2013 Dodge Ram 2500 w/ 6.7L Cummins Engine--2007.5-2013 Dodge Ram 3500 w/ 6.7L Cummins Engine
TechSpec Chassis Codes:	N/A
TechSpec Engine Codes:	N/A
TechSpec Includes:	(1) Mishimoto Thermostat--(1) O-ring--Mishimoto Lifetime Warranty
TechSpec Mishimoto Activation Temperature (F):	205
TechSpec Note:	N/A
TechSpec OEM Activation Temperature (F):	190

Application Summary

Part Type

Engine Coolant Thermostat

Data: v4.2 - Upd: 2026-09-29 08:29:20

Features

Ideal for cool climates
Mishimoto Lifetime Warranty
Restricts coolant system circulation for longer time to provide quicker warm up

Specifications

Product Attributes - UPC: 748354013139
Product Attributes - Brand: Mishimoto
Product Attributes - Notes: Factory-style O-ring.
Product Attributes - Quantity: Sold individually.
Product Attributes - Part Type: Thermostats, Mechanical
Product Attributes - Product Line: Mishimoto Thermostats
Product Attributes - Gaskets Included: Yes
Product Attributes - Thermostat Material: Copper/Stainless steel
Product Attributes - Thermostat Flow Rate: Standard-flow
Product Attributes - Manufacturer's Part Number: MMTS-RAM-99H
Product Attributes - Opening Temperature Rating (degrees F): 205 degrees F

Reference Information

Brand Name/s	Mishimoto
StreetFX SKU	misMMTS-RAM-99H
SFX Item ID	4050249
Supplier Item Code	4050249
Manufacturer SKU	MMTS-RAM-99H
Manufacturer UPC	748354013139
Alternative References	mio-mmts-ram-99h, MIMMMTS-RAM-99H, 5.9L/6.7L