5R110W Input Drum 2003

The name on this listing says input drum, but what ships is the back half of the job on a four-wheel-drive TorqShift: a remanufactured 4x4 extension housing for the Ford 5R110W with the output shaft already pressed in, a new rear seal fitted and a gasket in the box. It is catalogued for 2003 through 2010 trucks, which takes in the 6.0L Power Stroke years and the 6.4L years of the F-250, F-350, F-450 and F-550 Super Duty plus the 4x4 Excursion. Buyers usually land here after finding ATF on the transfer case, a cracked adapter ear, or output shaft splines that are twisted or stepped from years of towing.

What the extension housing and output shaft do on a 4x4 5R110W

On a 4x4 truck there is no rear yoke on the transmission. Instead, the extension housing bolts to the back of the case and gives the transfer case something to mount to, while the output shaft runs through it and slides into the transfer case input gear. Every pound-foot the engine sends to the wheels passes through those splines. The housing is also where the output shaft speed sensor lives; Transmission Digest's original TorqShift write-up describes it as a Hall-effect sensor reading its own tooth ring next to the park gear. The computer uses that signal for road speed and shift timing, so a damaged sensor bore can create drivability complaints that look like a transmission fault.

This assembly comes refurbished: the housing has been cleaned and painted and the shaft installed, so you are not pressing bearings or hunting for a usable core at the parts counter. The listing carries the Ford reference number RF-3C3P-7A040-HE, which is worth comparing against the tag or casting on your old housing.

Symptoms that send people looking for this part

• Red fluid seeping at the transmission-to-transfer-case joint even after the seal was replaced
• A crack in the adapter casting, often next to a mounting boss
• Driveline clunk when shifting from Drive to Reverse that follows worn output shaft splines
• The transmission fluid level dropping while the transfer case level climbs
• Speedometer drop-outs or erratic shift points traced to the output shaft speed signal

How to confirm before ordering

Wash the area and drive a short loop, then look for where wet fluid starts. A transfer case input seal and a transmission rear seal leak in almost the same spot, and the color tells you which: Mercon SP in the transmission is red, and the transfer case fluid is a different product. Check both fill levels. If you suspect the shaft, pull the transfer case and inspect both ends of the shaft and the mating splines in the transfer case gear. For speed or shift complaints, compare output shaft speed against wheel speed on a scan tool before blaming the housing; our TorqShift service guide lays out the sensor and service points, and the 5R110 shift solenoid guide helps rule out the electrical side.

Fitment

For 2003-2010 5R110W TorqShift units in four-wheel-drive trucks only. A 2WD truck and the E-Series vans use a different tail housing for a driveshaft yoke, so this will not fit them. The shaft has 25 splines on the input end and 34 on the output end. Before you order, count both ends of your old shaft and compare the shape and bolt pattern of your housing with the photos. If anything does not line up, send us your year and VIN and we will check it. Every part we stock for this transmission is on the 5R110W TorqShift collection page, and a second listing of the same housing is here if you need two.

Install notes

• Drain the transmission, support it on a jack, and remove the driveshafts and transfer case first.
• Unplug the speed sensor and move it to the new housing with a fresh O-ring; route the connector the way it came out.
• Scrape both mating faces clean, install the supplied gasket dry, and run the housing bolts down evenly to the factory torque.
• Lube the seal lip and the shaft splines before sliding the transfer case back on, and fit a new transfer case input seal while it is apart.
• Refill with Motorcraft Mercon SP and set the level hot. If the unit is due for service, add the FT144 filter kit; if the fluid came out burnt, a 5R110W banner rebuild kit is the next conversation.

Is this an input drum or an extension housing?

It is a 4x4 extension housing with the output shaft installed. The part name in the title is a catalog label; the photos and the contents are the rear housing assembly for the 5R110W, with a new rear seal fitted and a gasket included.

Will it fit my 2WD F-250 or E-350?

No. This housing is for four-wheel-drive trucks that bolt a transfer case to the transmission. Two-wheel-drive Super Duty trucks and E-Series vans use a different tail housing for a driveshaft yoke.

How do I know the output shaft matches mine?

Count the splines. The shaft in this assembly has 25 on the input end and 34 on the output end. Compare your housing shape and bolt holes with the photos too, or send us your year and VIN and we will confirm.

Do I need to move parts from my old housing?

Yes, the output shaft speed sensor transfers over. Use a new O-ring on it. Also plan to replace the transfer case input seal while everything is apart.

What fluid does it take after the swap?

Motorcraft Mercon SP. You will lose fluid when the housing comes off, so top it up and check the level hot with the engine running.

• Ford 5R110 TorqShift Service Guide: What Every Super Duty Tech Needs to Know
• 5R110 TorqShift Shift Solenoid Symptoms, Testing and Replacement
• 5R110 TorqShift Rebuild Guide: Known Wear Points and Upgrades