5R110W Transmission Cooler 2007

If your 2007 Ford F-250 Super Duty is dripping red fluid along the frame rail, the TorqShift temperature gauge is climbing on a long pull, or a line rusted through at a clamp, this is the part you are looking for. The listing photo shows a full-length steel transmission cooler line assembly, the supply and return tubes that run from the 5R110W case up to the cooler at the front of the truck. It is a used factory assembly, pulled and ready to install, which matters on a 2007 truck where the routing, bends and fittings are specific to the chassis.

What the cooler lines do in a 5R110W

The 5R110W is a heavy-duty five-speed that makes a lot of heat, especially behind a diesel that tows. Fluid leaves the transmission through one line, passes through the cooler in front of the radiator, and comes back through the other line to feed the lube circuit. The 2007 model year sits inside the period when Ford used an unusual bypass filtration system on this unit. Transmission Digest technical editor Mike Riley describes it: instead of an ordinary inline filter, most of the cooler oil goes around a spin-on element and only a small share is forced through it, so over a few thousand miles all of the fluid gets filtered. Ford began dropping that external bypass system in 2008 in favor of a redesigned sump filter. On a 2007 truck the cooler line circuit is part of the filtration system, not just plumbing.

Symptoms of a failed cooler line

• Fluid wetting the frame rail, crossmember or the front of the transmission, often worst at a fitting or a rubber section
• Low fluid level after every few hundred miles with no leak at the pan or case
• Rising transmission temperature when towing, from a kinked or crushed tube restricting flow
• Shift flare or slipping once the level has dropped, the same complaints the 5R110W shows when the intermediate and coast clutches start to burn
• Rust pitting along the steel tube where it rides in clamps or near the exhaust

How to confirm the lines are the problem

Clean the area, run the truck to temperature and look for fresh fluid with a light. Trace the line from the case fittings forward and flex any rubber sections; cracked hose or a weeping crimp is common on high-mileage trucks. Check that the remote spin-on filter housing is not the actual leak, since it lives in the same circuit. If fluid has been low, pull the pan and look at the contents before you spend money; our 5R110 TorqShift service guide covers the level check and what normal pan debris looks like. If you see heavy clutch material, the lines are not your only problem, and our 5R110 rebuild wear points guide explains what usually fails next.

Fitment

This assembly is listed for the 2007 model year and referenced to the F-250. Super Duty cooler lines are not one-size-fits-all: routing can differ between engines, two- and four-wheel drive, cab and bed length, and trucks with and without the factory remote filter setup. Compare the end fittings, bend pattern and overall length with the lines on your truck, or send us your year and VIN and we will check it before it ships. The rest of the TorqShift parts we carry are on the 5R110W parts page.

Install notes

• Lower the line out from under the truck with the fittings disconnected at both ends; support it so the tube does not kink while you work it past the crossmember.
• Clean the fittings and inspect the seals at the case and cooler before connecting.
• If the transmission failed, Ford's direction is to replace the oil-to-air cooler rather than flush it, because debris stays in the core.
• Change the remote spin-on filter and the pan filter at the same time; our 5R110W TorqShift filter kit covers the 6.0L trucks.
• Refill with the correct Ford fluid (Mercon SP, or Mercon LV where Ford has approved it as the replacement) and check level hot, cycling through every range.

If you are pulling the transmission anyway, a 5R110W pump is worth looking at while it is out. Make sure any replacement pump is the bypass-style version for a truck that still has the factory external filter system.

Is this a cooler core or the cooler lines?

The listing photo shows the steel transmission cooler line assembly, the long supply and return tubes that run from the transmission to the cooler. It is not the radiator-mounted cooler core.

Will it fit my 2007 F-350 or a gas F-250?

It is listed for a 2007 F-250. Line routing on Super Duty trucks can change with engine, drivetrain and wheelbase, so compare the fittings and bends with yours or send us your year and VIN before ordering.

What fluid does the 5R110W take after I replace the lines?

Ford specified Mercon SP for the 5R110W, and later Ford service information approves Mercon LV as its replacement for a refill or top-off. Do not use Mercon V or a universal fluid.

Do I need to replace the cooler too?

If you are only fixing a leaking or damaged line, no. If the transmission failed and sent clutch material through the circuit, Ford's position is that the oil-to-air cooler should be replaced rather than flushed.

Should I change the remote filter at the same time?

Yes. On a 2007 truck the remote spin-on filter is part of the cooler circuit, so replace it along with the pan filter while the system is open.

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