48RE Sprag Clutch 2003, remanufactured and ready to install. Fits the 48RE. Ships fast from the USA.
Despite the name on this listing, the part is not a sprag. It is a rebuilt, dyno-tested 48RE diesel valve body for 2003 and later Dodge Ram 2500 and 3500 trucks with the 5.9L Cummins. If your truck slips in overdrive under load, shudders or drops out of lockup while towing, or shifts harsh or late, and the pan and pump check out, a worn valve body is the usual cause on a high-mileage 48RE.
The 48RE is the heavy-duty update of the RE four-speed, and its valve body is not just a 47RE body with a new part number. Sonnax showed that its pressure regulator boost raises line pressure about 22 to 28 psi whenever the converter clutch or overdrive clutch applies, more than double the boost on a 46/47RE, to give those clutches enough clamping force for diesel torque. Transmission Digest documented the other big change: the 48RE feeds the converter clutch solenoid from forward clutch oil instead of second gear oil, which lets the computer lock the converter in manual first and second for towing.
This unit uses factory-style castings and separator plates (number 27 upper and A0 lower), not a converted or replicated body. The listing calls out these updates:
Rule out low fluid, a restricted cooler and a pump that cannot hold pressure first; our 48RE pump failure guide covers that test. Then check the overdrive and TCC solenoids with the 48RE solenoid testing guide. If the electrical side is good and line pressure will not rise on lockup and fourth, the body is the problem.
The listing fits 48RE diesel trucks from 2003 up, the Ram 2500 and 3500 with the 5.9L Cummins. There is one split to know about. In 2005 Dodge replaced the throttle valve cable with an electronic throttle valve actuator on these trucks. Transmission Digest notes the throttle-shaft adjustment bolt on the pressure regulator spring bracket must measure 0.905 inch on actuator trucks; cable-style brackets can be as short as 0.820 inch and will set P1751 or P1752 on a 2005-up truck. Check that measurement on install, and send us your year and VIN if you want us to confirm fitment. See every 48RE part we stock in our 48RE parts collection.
| Fits | 48RE 2003 |
| Part type | Sprag Clutch |
| Condition | Remanufactured |
| Brand | Sonnax |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. The listing name is wrong; the part is a rebuilt 48RE diesel valve body for 2003-up Ram 2500/3500 Cummins trucks, as shown in the photo.
It is listed for 2003-up 48RE diesel trucks. On actuator-equipped trucks, set the throttle-shaft adjustment bolt to 0.905 inch and run the 30-second key-on initialization, or the truck can set P1751 or P1752.
Sonnax reports that 46/47RE bodies in 48RE trucks often return with failed converter or overdrive clutches because they lack the 48RE line pressure boost and TCC feed. Use a 48RE body like this one.
Yes, the listing states solenoids are included along with the updated pressure regulator, manual valve, solenoid switch valve and throttle valve.
Change the filter, use ATF+4, and flush or replace the cooler. If line pressure tested low, replace the pump too.
