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Heating and Cooling› Oil and Fluid Coolers
Mishimoto
Mishimoto 03-07 Dodge Ram 5.9L Cummins Replacement Transmission Cooler
SKU: M00C MMTC-RAM-03TQ
Moderate — 2–4 hours
Overview
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Part #: MMTC-RAM-03TQ
The factory transmission oil cooler on your 2003-2007 Dodge Ram 5.9L Cummins is a liquid-to-liquid cooling unit, utilizing the engine's cooling system to cool the transmission fluid during warm outside temperatures and warm the fluid during cold outside temperatures. This design is tried and true, and it works. Until it doesn't. When they wear out and fail, it can leak coolant into your transmission fluid. Mixing coolant into your transmission fluid can have catastrophic results, and nobody wants to spend thousands of dollars to rebuild or replace their transmission if it can be avoided. The Mishimoto Replacement Transmission Oil Cooler is a direct fit, OEM replacement that requires no modification to install. Made to OEM specifications, this transmission oil cooler is equivalent to an OEM part. By replacing your transmission cooler preventatively, you can save your transmission from falling victim to premature failure. As with all of our products, this cooler is backed by our signature Mishimoto Lifetime Warranty.
Features:
- Direct fit for 2003-2007 Dodge Ram 5.9L Cummins
- Replaces leaking or failing factory transmission oil cooler
- Durable, corrosion-resistant aluminum construction
- Equivalent to OEM specifications for fit and function
- Includes bracket for easy installation
- Utilizes all factory lines and hardware
- No modification required for installation
- Includes Mishimoto Lifetime Warranty
Replacement Transmission Oil Cooler, fits 2003-2007 Dodge Ram 5.9L Cummins
Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Fitment
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Specifications
| Brand | Mishimoto |
| Part Number | M00C MMTC-RAM-03TQ |
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Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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