48RE Solenoid Kit 1994-2008, new and ready to install. Fits the 48RE. Ships fast from the USA.
This is a new governor service kit for the Chrysler RE automatic, the 46RE, 47RE and 48RE that went into Dodge Ram trucks, including the 2003-2007 Ram 2500 and 3500 with the 5.9L Cummins. It is aimed at the owner whose truck shifts late and hard one day and early and soft the next, starts out in second, or sets governor pressure codes, and who wants to do the whole job with one pan drop. The product photo shows a governor pressure solenoid, a rectangular governor pressure sensor, a threaded speed sensor, the governor body gasket, a transmission filter, a pan gasket and a coil spring. The listing carries an A518 reference, which is the original name of the 46RE.
A 48RE does not have spinning governor weights. The computer reads road speed from a speed sensor, picks a target governor pressure, and pulses the governor pressure solenoid to bleed line pressure down to that target. The pressure sensor, also called the transducer, reports the real pressure back so the computer can trim the solenoid. Governor pressure is what pushes the 1-2 and 2-3 shift valves, so if any part of this loop lies or leaks, the shift points move. Transmission Digest's Jeff Parlee notes that the 42RE-48RE family is one of the few that reports pressure back to the computer this way, which is why a bad sensor can make a good solenoid look guilty.
Do not trust the scan tool alone. The pressure the computer commands is not proof of what is in the case, so tee a 0-100 psi gauge into the governor port and compare it with the scan tool's actual reading. If the gauge and scan tool agree but the pressure is wrong, the solenoid or a leak is at fault; if they disagree, the sensor is. Rule out the speed sensor too, because with no road-speed signal the computer will not build governor pressure at all. Our governor pressure solenoid guide walks through the full test, and the Ram 3500 Cummins shift problems guide covers the other causes of bad shift timing on these trucks.
The listing covers 1994-2008, which is wider than any one set of these parts really fits. Sonnax's RE valve body identification splits governor pressure sensors at the 1999/2000 line: 1999 and earlier units use an early sensor with an oval connector, and 2000-later units use a rectangular plastic sensor. The sensor in this kit's photo is the rectangular late style, so it lines up with 2000-and-later 46RE and 47RE trucks and with every 2003-2008 48RE. A 1994-1995 truck that still has a mechanical governor on the output shaft does not use governor solenoid or sensor parts at all. Pull the pan and look at your sensor plug before ordering, or send us your year and VIN and we will check. The rest of our RE-family parts are on the 48RE parts page.
On a truck that tows, heat is what kills these parts, so an auxiliary 48RE transmission cooler is worth adding. If the overdrive or lockup side is also acting up, the 2003-2008 solenoid kit covers the late heavy-duty trucks.
| Fits | 48RE 1994-2008 |
| Part type | Solenoid Kit |
| Condition | New |
| Brand | OEM |
| Reference | A518 |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Probably not. The sensor in this kit is the rectangular late style that Sonnax ties to 2000-and-later RE units, and early-1990s trucks with a mechanical governor do not use these parts. Send us your year and VIN and we will tell you what fits.
Yes, that is the strongest match. Every true 48RE uses the late rectangular governor pressure sensor shown in the photo. Compare your old parts with the photo before installing.
On a high-mileage truck it makes sense, because the solenoid and the sensor work as one closed loop and a fault in either throws off shift timing. Since the pan has to come off anyway, doing both with a new filter avoids a second job.
Chrysler lists about 8 pints, 3.8 liters, for a pan and filter service on a 2006 Ram with the 48RE, and 29-33 pints for a dry overhaul fill. Use ATF+4 and check the level hot in Neutral.
It might be, but check the speed sensor first. If the computer loses the road-speed signal it will not build governor pressure, and the truck stays in first. A scan tool showing zero output speed while moving points to the speed sensor or its wiring.
