48RE Internal Wiring Harness 1994, new and ready to install. Fits the 48RE. Ships fast from the USA.
If the plug that clips onto the side of your 48RE is cracked, the locking tab has snapped off, or the wires behind it are melted, brittle or green with corrosion, you do not need a whole new engine-bay harness. This is a new transmission harness connector repair kit: a fresh round connector body with 10-inch color-coded leads already pinned in, eight crimp-style heat-shrink butt connectors, and a wiring diagram so you can splice it onto the truck side of the harness one wire at a time. Although this item is filed as an internal harness, it is the vehicle-side pigtail, not the solenoid pack inside the pan. The kit is made to cover the whole RE family from 1994 on, so it fits the 48RE in the 2003-2007 Ram 2500 and 3500 with the 5.9L Cummins as well as the 42RE, 44RE, 46RE and 47RE.
The 48RE shifts 1-2 and 2-3 hydraulically, using governor pressure that the engine computer builds and reads electrically. The governor pressure solenoid and pressure transducer, plus the overdrive and converter lockup solenoids, all sit on the valve body and get their power and ground through the round connector on the transmission case. When that plug loses a pin, the computer loses control of the governor circuit or the 3-4 and lockup solenoids, and the truck drops into a limp strategy. On a Cummins the connector lives in a hot, oily, vibrating spot near the exhaust, so heat-hardened plastic and fatigued wires are a common age failure rather than a freak event.
Unplug the connector and look at both halves with a light. Pushed-back pins, corrosion and heat damage are easy to see. With the engine running and codes cleared, wiggle the loom near the plug while watching for the fault to return; a problem that follows the wiggle points to wiring, not to the solenoids. If the plug and wires look clean, test the solenoids themselves using our 48RE shift solenoid testing guide, and work through the Ram 2500 Cummins shift problems guide for the hydraulic causes that mimic an electrical fault. Transmission Digest also points out that on the 48RE the lockup solenoid is fed forward clutch oil, so a stuck lockup solenoid can stall the engine in Drive, a mechanical fault no connector will fix.
This kit is made for the round transmission case connector used on Chrysler, Dodge and Jeep RE-series automatics from 1994 on. On our 48RE pages that means the 2003-2007 Ram 2500 and 3500 with the 5.9L Cummins. It is not the connector for the electric throttle valve actuator Dodge added to diesel Rams for 2005; that unit has its own plug. Before you cut anything, compare the shape and keying of your old connector with the photo, count the wires, and match each color against the supplied diagram. If you are unsure, send us your year and VIN and we will check it. You can see every part we carry for this unit on the 48RE parts page.
Disconnect the batteries first; the Cummins has two. Cut the old connector off one wire at a time, leaving as much good wire as possible, and splice each new lead to its matching color with the supplied butt connectors so you cannot cross circuits. Stagger the splices so the bundle stays slim, shrink each one with a heat gun, then wrap and loom the repair and tie it away from the exhaust. If the case side of the connector was leaking, the leak is at the internal harness seal, and the 48RE solenoid kit for 2003-2008 is the fix while the pan is down. Trucks with erratic 1-2 and 2-3 shifts should also look at the governor pressure solenoid. Check the level with ATF+4 only, and clear codes before the road test.
| Fits | 48RE 1994 |
| Part type | Internal Wiring Harness |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. It is a new connector and pigtail for the truck side of the round transmission case plug, with 10-inch leads, eight crimp-style butt connectors and a wiring diagram. The internal harness and solenoid pack are a separate part.
It is made for the RE-family case connector used from 1994 on, which includes the 48RE. Compare your old plug's shape, keying and wire count with the photo before splicing, or send us your year and VIN to check.
No. The electric throttle valve actuator Dodge added for 2005 has its own connector. This kit is only for the round case connector that feeds the valve body solenoids and governor pressure circuit.
Usually limp mode stuck in second, intermittent overdrive or lockup, erratic governor-controlled shifts, or electrical codes that return after new solenoids. Problems that change when you wiggle the loom point to the plug or wires.
Mopar ATF+4. Chrysler warns that a non-specified fluid can cause poor shift quality and converter shudder. Check the level hot with the engine idling in Neutral on level ground.
