2008 Ford F-250 Super Duty Problems: 5 Known Issues

On the 2003-2010 Ford F-250 Super Duty, the 5R110W TorqShift automatic behind the 6.0L and 6.4L Super Duty trucks is a strong unit, but its stamped-steel torque converter with a single-disc lockup clutch is the weak link. Heat from towing, added horsepower, or fluid that was never changed cooks the lockup clutch lining. When the converter fails it does not fail cleanly - it sends clutch material and steel debris through the entire transmission, contaminating the valve body, the shift solenoids and the cooler circuit, so a converter failure typically takes the transmission with it. Owners first notice a shudder or vibration at lockup speeds, then harsh or erratic 3-4 and 4-5 shifts, then slipping. Solenoid faults and hard shifts on these trucks are frequently the downstream symptom of debris rather than an independent problem.

On the 2008-2010 Ford F-250 Super Duty 6.4L Power Stroke V8 diesel, to regenerate the diesel particulate filter, the 2008-2010 6.4L injects fuel late in the cylinder rather than through a downstream dosing injector. That post-injection fuel washes down the cylinder walls and ends up in the crankcase. On trucks used for short trips or lots of idling, where regens start but never complete, the oil level climbs above the full mark - owners routinely report draining an extra gallon at a normal oil change and oil that smells like diesel and feels thin. Diluted oil loses its film strength and takes out main and rod bearings, the turbochargers and the valvetrain, which is why this quiet problem is behind a large share of 6.4 engine failures. It is a design characteristic of this engine's emissions strategy, not a defect of any one truck.

On the 2005-2008 Ford F-250 Super Duty, certain early-build three-valve engines can retain part of a spark plug in the head during removal. This differs from plug ejection. Identify the installed engine, head and plug design before service; vehicle model year alone is insufficient.

On the 2008-2010 Ford F-250 Super Duty 6.4L Power Stroke V8 diesel, the factory radiator on the 2008-2010 6.4L Power Stroke uses plastic end tanks crimped to an aluminum core. The crimps work loose and the tank-to-core seal separates, so the radiator begins seeping and then dumping coolant - typically down the driver's side. It is one of the most reported non-engine failures on this truck and it frequently strikes well inside 100,000 miles; forum threads document dealers confirming failed tank seals at around 60,000 miles with no warranty assistance and quoting the owner four figures. Because the 6.4 already runs two separate cooling circuits and is heat-sensitive, ignoring it risks overheating and piston damage.

On the 1999-2025 Ford F-250 Super Duty, the factory steering damper on the F-250 Super Duty wears out and fails, leading to increased steering shimmy, vibration at highway speeds, and reduced ability to dampen road imperfections. The single factory damper is often inadequate for the weight and solid front axle of the Super Duty. A worn damper does not cause death wobble directly but removes the last line of defense against oscillation. Most factory dampers are worn out by 50,000-80,000 miles.