Hy eggofire, as others have mentioned if you park the truck with the front end facing downhill the transmission might leak lube out the front bearing retainer into the clutch area, under "normal circumstances" this doesn't happen. When you take everything apart to check/replace, check the rear main seal of the engine as well as it my also be contributing to the oil contamination problem. You might even find that your problem is the pressure plate itself, good luck, hope that helps.
