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

Mishimoto
MISMMTS-RAM-99H
748354013139
Thermostats
20+ Units In Stock - Ships Next Business Day
$ 92.00 $ 83.95
$ 83.95

SKU: MMTS-RAM-99H | UPC: 748354013139

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

The Mishimoto High-Temperature Thermostat upgrades Dodge Ram trucks equipped with 5.9L and 6.7L Cummins diesel engines from 1999 to 2013, including 1500, 2500, 3500, 4500, and 5500 models across Laramie, SLT, ST, and more submodels. It opens at 221°F compared to stock 195°F for quicker warm-up, sustained higher coolant temperatures, reduced wet stacking, and improved turbocharger performance. This direct-fit part delivers reliable cooling control for daily driving or heavy towing.

Key Features

  • 221°F Opening Temperature: Keeps coolant hotter longer to boost fuel efficiency, enhance turbo spool-up, and minimize emissions in modified Cummins engines
  • CNC-Machined Billet Aluminum Housing: Provides superior strength, heat resistance, and precise fit versus cast OEM housings
  • Direct OEM Replacement Design: Bolts in place of factory thermostat with no modifications for straightforward servicing
  • Included Gaskets and O-Rings: Ensures a secure, leak-proof seal right out of the box for dependable operation
  • Black Anodized Finish: Resists corrosion and wear while dissipating heat effectively under high-load conditions

Product Notes

  • Consult application guide for exact vehicle compatibility before purchase
  • Pair with high-performance coolant for maximum temperature stability
  • Product weight 0.8 lbs. ships in 3 x 5 x 6 inch box

Installation Notes

  • Professional installation recommended.
  • Drain cooling system completely and flush before install to prevent contamination
  • Use OEM torque specs on housing bolts. includes all necessary seals

This Part Fits

Year Make Model Submodel
1999-2001,2003 Dodge Ram 1500 Laramie
2002-2003 Dodge Ram 1500 SLT
1999-2001 Dodge Ram 1500 Sport
1999-2003 Dodge Ram 1500 ST
1999-2002 Dodge Ram 2500 Base
2007-2010 Dodge Ram 2500 Laramie
2007-2010 Dodge Ram 2500 SLT
2007-2010 Dodge Ram 2500 ST
2008-2010 Dodge Ram 2500 SXT
1999-2002 Dodge Ram 3500 Base
2003-2010 Dodge Ram 3500 Laramie
2003-2010 Dodge Ram 3500 SLT
2006-2007 Dodge Ram 3500 Sport
2003-2010 Dodge Ram 3500 ST
2008-2010 Dodge Ram 3500 SXT
2007 Dodge Ram 3500 TRX4
2008-2010 Dodge Ram 4500 Laramie
2008-2010 Dodge Ram 4500 SLT
2008-2010 Dodge Ram 4500 ST
2008-2010 Dodge Ram 5500 Laramie
2008-2010 Dodge Ram 5500 SLT
2008-2010 Dodge Ram 5500 ST
2013 Ram 2500 Big Horn
2011-2013 Ram 2500 Laramie
2011-2013 Ram 2500 Laramie Longhorn
2013 Ram 2500 Lone Star
2012-2013 Ram 2500 Outdoorsman
2011-2013 Ram 2500 Power Wagon
2011-2013 Ram 2500 SLT
2011-2013 Ram 2500 ST
2013 Ram 2500 Tradesman

Why Choose Mishimoto?

  • Lifetime warranty protects your investment for years of use
  • Engineered and dyno-tested for real-world Cummins durability
  • Direct-fit precision from USA-based design team

Frequently Asked Questions

  • Q: Will this thermostat fit my 2007-2010 Dodge Ram 2500 6.7L Cummins Laramie?
    A: Yes, it is direct-fit for all listed 2007-2010 Dodge Ram 2500 submodels with 6.7L Cummins including Laramie, SLT, ST, and SXT
  • Q: What material is used for the thermostat housing?
    A: High-strength billet aluminum CNC machined and finished with black anodizing for corrosion resistance and heat management
  • Q: How long is the Mishimoto warranty on this part?
    A: Covered by Mishimoto Lifetime Warranty against defects in materials and workmanship when installed and used properly

Shipping & Handling

  • Method: UPS Ground or USPS Priority
  • Availability: In stock - ships same or next business day
  • Packaging: Protective Mishimoto box measuring 3 x 5 x 6 inches
  • Weight: 0.8 lbs

Request For Information

Have questions about Mishimoto Dodge 5.9L/6.7L Cummins High-Temperature Thermostat? Fill out the form below and we'll get back to you by the next business day.
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