5R110W Reaction Shell, remanufactured and ready to install. Fits the 5R110W. Ships fast from the USA.
Although this item sits in our catalog under the reaction shell name, what you receive is the back end of a two-wheel-drive TorqShift: a remanufactured 5R110W tail housing, casting number RF-3C3P-7A040-EC, for 2003-and-later 2WD transmissions. It is built for the owner of a 2WD Super Duty or E-Series van who is chasing a rear seal that keeps leaking, a driveshaft that clunks or shudders because the slip yoke has worn the bushing, or a cracked housing after driveline damage. The aluminum housing has been cleaned and inspected, then fitted with a new tail bushing, a new output seal and a new output bearing, and a new tail housing gasket is included.
On a two-wheel-drive TorqShift the tail housing closes the rear of the case and carries the far end of the output shaft. The bearing locates the shaft, the bushing supports the driveshaft slip yoke as the suspension moves, and the seal keeps Mercon SP in while the yoke slides in and out. The housing also holds a sensor the computer cannot do without. Transmission Digest's TorqShift overview places the output shaft speed (OSS) sensor on this extension housing; it is a Hall-effect sensor reading a dedicated set of teeth beside the park gear, and the PCM uses it for vehicle speed, shift scheduling and converter clutch control. A worn bearing that lets the shaft move, or a damaged sensor bore, can show up as shift complaints as well as a leak.
Clean the rear of the transmission and recheck after a drive to be sure the leak is not coming from the pan gasket or the cooler lines running past it. With the driveshaft out, inspect the yoke: a grooved or rough seal surface will chew up any new seal and should be replaced too. Rock the output shaft by hand to feel for bearing play, and check the OSS reading on a scan tool against wheel speed. If the problem is in the shift behavior rather than the rear of the unit, start with our TorqShift service guide.
This housing is for two-wheel-drive 5R110W transmissions, 2003 and up, matching case number RF-3C3P-7A040-EC. Four-wheel-drive trucks use a separate adapter that bolts to the transfer case, so this part will not fit a 4x4. Compare the casting number, bolt pattern and OSS sensor location with your old housing before you order, or send us your year and VIN to check. The full TorqShift lineup is on the 5R110W parts page.
| Fits | 5R110W |
| Part type | Reaction Shell |
| Condition | Remanufactured |
| 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 remanufactured 2WD tail housing for the 5R110W, casting RF-3C3P-7A040-EC, with a new bushing, output seal and output bearing installed and a new gasket included.
No. Four-wheel-drive TorqShift transmissions use a different adapter housing that mates to the transfer case. This housing is for 2WD units only.
No sensor is listed. Move your existing OSS sensor over to the new housing with a fresh O-ring.
Usually a worn tail bushing lets the yoke move off center, or the yoke itself is grooved. This housing has a new bushing and seal; inspect the yoke and replace it if the seal surface is worn.
Mercon SP. Ford states Mercon and Mercon V are not interchangeable with it. Check the level hot on the dipstick after the road test.
