This post took a turn, but I have a question. Had you driven the truck prior to finding the grease on the floor? I would definitely check the fluid level, but also consider that the leak could be at the pinion seal and only leaks when the rear is warmed up. Of course, the grease would run back onto the bottom of the cover and could make it look like the cover was leaking. Also is the vent open? The rear will build pressure if it can't vent.

1952 Champion Starlight, 1962 Daytona, both w/overdrive.Searcy,Arkansas
"I may be lazy, but I'm not shiftless."

1952 Champion Starlight, 1962 Daytona, both w/overdrive.Searcy,Arkansas
"I may be lazy, but I'm not shiftless."
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