The factory liquid-to-liquid transmission oil cooler on the 2003-2007 Dodge Ram 5.9L Cummins uses engine coolant to regulate transmission fluid temperature. When the unit wears out it can leak coolant into the transmission fluid — a mix that can destroy a transmission. This Mishimoto replacement is a direct-fit, OEM-equivalent oil cooler that installs with no modification, letting you replace the factory cooler preventatively before it fails. Made to OEM specifications in corrosion-resistant aluminum, it includes a new powder-coated bracket and brass fittings.
| Type | OEM-replacement transmission oil cooler (liquid-to-liquid) |
| Material | Corrosion-resistant aluminum |
| Included | New powder-coated bracket, brass fittings |
| Fit | Direct-fit, OEM-equivalent, no modification |
| Part Number | MMTC-RAM-03TQ |
| Warranty | Mishimoto Lifetime Warranty |
Documents: Installation Instructions (PDF)
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2003 | Dodge | Ram 1500 | Laramie |
| 2003 | Dodge | Ram 1500 | SLT |
| 2003 | Dodge | Ram 1500 | ST |
| 2003,2005-2007 | Dodge | Ram 2500 | Laramie |
| 2003-2007 | Dodge | Ram 2500 | SLT |
| 2006-2007 | Dodge | Ram 2500 | Sport |
| 2003-2007 | Dodge | Ram 2500 | ST |
| 2006-2007 | Dodge | Ram 2500 | TRX4 |
| 2003-2007 | Dodge | Ram 3500 | Laramie |
| 2003-2007 | Dodge | Ram 3500 | SLT |
| 2006-2007 | Dodge | Ram 3500 | Sport |
| 2003-2007 | Dodge | Ram 3500 | ST |
| 2007 | Dodge | Ram 3500 | TRX4 |
Shipping: In-stock orders placed before 3 PM EST ship the same day, and everything else ships within 24 hours. Standard, expedited, and overnight options are available at checkout. Backordered items ship as soon as we get them back in stock. Contact us for lead times. See the full Shipping Policy.
Returns: 30-day returns on new, unused items in original packaging. See the full Refund Policy.
