48RE Valve Body 2003-08, new other (see details) and ready to install. Fits the 48RE. Ships fast from the USA.
A 48RE that cooks overdrive clutches or slips the converter clutch while towing is often running a valve body that cannot hold the pressure this transmission was built for. Owners of 2003 and later Ram 2500 and 3500 trucks with the 5.9L Cummins search for exactly that: a replacement 48RE valve body that restores lockup and overdrive clamping without paying for a full rebuild. This TransGo-branded unit is listed for 2003-2008 in new-other condition, meaning unused but not necessarily in retail packaging.
The 48RE looks almost identical to the 46RE and 47RE that came before it, but its valve body is calibrated differently, and that difference is the whole point of buying a true 48RE unit. On the earlier units the boost valve raises line pressure only about 10-15 psi when the converter clutch locks or fourth gear applies. On the 48RE, Sonnax measured that rise at roughly 22-28 psi, because two reducing points are exhausted at the boost valve instead of one. That extra pressure is what clamps the converter clutch and overdrive clutch against diesel torque. The 48RE also feeds the TCC solenoid from the manual valve in any Drive position, so lockup is available in manual second, which a 46/47RE valve body cannot do.
Put gauges on the line and governor pressure ports. Governor pressure should sit near zero at a stop and rise smoothly with road speed, topping out around 100 psi; erratic governor pressure with a good solenoid and transducer points into the valve body. A vacuum test of the pressure regulator, lockup boost and governor plug bores confirms wear before you tear anything down. Our 48RE valve body testing guide walks through each port, and the 48RE Cummins problems guide separates valve body faults from clutch and band wear.
This listing covers 48RE transmissions from 2003 through 2008. Most of these went behind the 5.9L Cummins in Ram 2500 and 3500 trucks until the 6.7L arrived with the 68RFE, so confirm the tag on the driver side of your case reads 48RE before ordering. Pay attention to the throttle valve hardware: 2003-2004 diesels use a throttle valve cable, while 2005 and later diesels switched to the electronic transmission throttle valve actuator (TTVA), and the valve body throttle lever has to engage whichever one your truck has. If you are unsure, send us your year and VIN. The rest of our 48RE parts are on the 48RE parts collection.
| Fits | 48RE 2003-08 |
| Part type | Valve Body |
| Condition | New Other (See Details) |
| Brand | TransGo |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It will bolt in and may drive normally at first, but the 47RE calibration raises line pressure less on lockup and fourth gear. Sonnax ties that swap to failed converter clutches and overdrive clutches later on, so use a 48RE valve body.
The 48RE from 2005 on uses the electronic throttle valve actuator on diesel trucks. The valve body throttle lever has to engage the actuator correctly, so confirm with your year and VIN and initialize the TTVA after installation.
The unit is unused but may not come in its original retail packaging. The photos on this page show the part that ships.
ATF+4 only. Chrysler lists about 8 pints for a pan and filter service and considerably more for a full refill after an overhaul.
On a high-mileage truck, yes. A sticking governor solenoid causes the same shift timing complaints as a worn valve body, and replacing both avoids a second pan drop.
