Driving home from work yesterday and put my foot into it to pass a car and clutch slipped a good bit. Changed my oil a few days ago and noticed a few drops of oil on the bellhousing. Didn't see any leaks anywhere that were obvious so figured it may be the very cold weather we have had. Last night I checked the valley and complete top and rear of the engine. No leaks of oil or fuel anywhere. HPOP is new and I rebuilt the fuel bowl while I did that upgrade. Oil crossover lines have a little oily mess around them but nothing I would call a leak. After I parked last night I put a piece of cardboard under the truck and I was getting a drop of oil about every 15 seconds (it was hot). Crawled under the truck and cannot see any fluids leaking down from up above at all. I'm fearing it may be the rear main. Have to drop the tranny for a new clutch now so I may as well do the main seal. I have read that they rarely leak but at 275,000 miles I guess I should do it while I am there. Has anyone performed this task without the $338+ special tool? Any tips? Thanks!