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.
| Brand | Mishimoto |
| 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 |
| 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 |
