Mishimoto · New

Mishimoto 03-07 Dodge Ram 5.9L Cummins Replacement Transmission Cooler

Name: Mishimoto 03-07 Dodge Ram 5.9L Cummins Replacement Transmission Cooler
Brand: Mishimoto
SKU: misMMTC-RAM-03TQ
Price: 220.00 USD

MPN MMTC-RAM-03TQ · Store SKU misMMTC-RAM-03TQ

$220.00

IN STOCK10 ready to ship

Supplier stock checked 11/8/2026, 10:16:34 AM UTC. Adding a part does not reserve it.

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Request a return within 30 calendar days after delivery. New parts must be unopened and unused.

Shipping & returns ↗This policy does not limit rights required by law.

Free standard shipping on eligible parts orders of $100 or more. Oversized and freight items excluded. Fitment, taxes, availability and final totals are confirmed before payment.

Product details

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. Automatic transmission oil cooler designed to regulate fluid temperature and prevent overheating. Enhances transmission longevity, maintains performance, and features durable construction with a precise fit. Replacement Transmission Oil Cooler, fits Dodge Ram 5.9L Cummins 2003-2007

Manufacturer fitment & guides

Check MMTC-RAM-03TQ against the manufacturer’s application information below.

Part-specific notes

California Proposition 65: Y

Manufacturer documents

Installation Instructions

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