Aluminum-base dipstick fill tube with triple O-rings that stops ATF seepage at the case on Powerstroke E4OD, 4R100 and 5R110 trucks.
A wet streak of transmission fluid down the left side of the case on a Power Stroke Super Duty or E-Series is often blamed on the pan gasket, the cooler lines or the front pump seal. On the E4OD, 4R100 and 5R110 a lot of those leaks start higher up, where the dipstick fill tube plugs into the case. This replacement tube takes the place of Ford XC3Z-7A160-AA and is built to stop that seep for good. It has a machined aluminum base and three oil-resistant O-rings on the sealing end, where the factory tube relies on one.
The fill tube is how fluid goes into the transmission and how the dipstick reaches the pan to read the level. Its lower end pushes into a bore in the case and seals with an O-ring, and a bracket bolt holds the upper end. Heat breaks that single factory O-ring down. It hardens and shrinks, and the tube can then move slightly in its bore. Hot fluid weeps past it, and on a hard-working diesel, especially one that tows or runs a little overfull, fluid can be pushed up and out under pressure. Three O-rings spread the seal across a longer surface, so one tired ring no longer means a leak.
Running low matters on these transmissions. Overheating under load is already one of the most common E4OD and 4R100 failures, and low fluid adds to it through slipping clutches and weak line pressure. Our E4OD common problems guide covers what heat does inside the unit.
Degrease the case, the tube base, the pan rail and the cooler line fittings, then drive until the transmission is at full temperature. Look with a light and follow the wet trail up to where it starts. If it begins at the tube base, this is your part. If it starts at a cooler line fitting, our E4OD cooler line replacement guide walks through that job. Fluid coming out of the bell housing points to the front pump seal or the pump instead. A UV dye kit makes the source clear if the leak is slow.
The listing covers Ford trucks with the 7.3L, 6.0L and 6.4L Power Stroke diesel and the E4OD, 4R100 or 5R110 automatic, 1989 through 2010, and it replaces Ford part number XC3Z-7A160-AA. That year range spans three transmissions and several body styles, and fill tube shapes vary between the F-Series Super Duty, the Excursion and the E-Series vans. The Power Stroke name only started in the 1994 model year, so owners of earlier diesel trucks should confirm the tube shape before ordering. Check that your current tube carries XC3Z-7A160-AA or matches the bend in our photos, or send us your year and VIN and we will confirm it. The dipstick itself is not listed as included, so plan to reuse yours. Find other parts for the same trucks in our E4OD and 4R100 collection.
| Replaces | XC3Z-7A160-AA |
| Transmissions | E4OD, 4R100, 5R110 |
| Engines listed | 7.3L, 6.0L, 6.4L Powerstroke diesel, 1989-2010 |
| Seal | Triple O-ring |
| Base | Machined aluminum |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The 7.3L Power Stroke with the 4R100 is one of the listed applications for the tube that replaces XC3Z-7A160-AA. Tube shapes vary by body style, so compare the bend with your current tube or send us your year and VIN to confirm before ordering.
The listing covers the fill tube. The dipstick is not listed as included, so plan to reuse your original dipstick.
Clean everything, drive to full temperature and follow the wet trail upward. A tube leak starts at the tube base on the case. A pan gasket leak stays along the pan rail, and fluid coming out of the bell housing points to the front seal or pump.
Usually neither. The tube pulls out of its bore in the case once the bracket bolt is removed. Clean the bore well, lube the new O-rings with ATF and push the tube in straight.
Bring the transmission to operating temperature, about 150 to 170 degrees F, let the engine idle in Park and read the dipstick. Add fluid in small amounts so you do not overfill it.
