The 6.0L Powerstroke in the 2004-2007 Super Duty has a lot of potential, and with the right aftermarket performance parts, it can just about keep up with any diesel out there today. One thing that causes a lot of concern in 6.0L owners is transmission reliability. The 5R110 is a great transmission, but a few things keep it from being truly bulletproof.
One of those things is a transmission pan with less than sufficient oil capacity and a standard stamped steel pan that doesn't dissipate heat quickly enough for heavy-duty applications. The last thing you want while you're off-roading is a failed transmission, so if you're the type that likes to push their Super Duty to its limits, check out the High Capacity Aluminum Transmission Pan by ATS, which you can see being installed on our 6.0L project truck right here: