I HAVE A FORD 4000 HD INDUSTRIAL,1964 MODEL,RECENTLY PURCHASED FOR A RESTORATION PROJECT. I NOTICED OIL DRIPPING BETWEEN THE ENGINE AND TRANNY. I ASSUME IT'S A REAR MAIN SEAL LEAKING. HOW HARD IS TO FIX? IN THE MANUAL IT SHOWS A SPECIAL TOOL TO INSTALL THE SEAL. IS THERE ANOTHER HOMEMADE VERSION OF THIS TOOL OR SOMETHING I CAN WHIP UP IN MY GARAGE? THE OIL PAN COVER IS TOTALLY ACCESSIBLE SO IT'S PROBABLY AN EASY FIX. ANY THOUGHTS WOULD BE APPRECIATED. DANNY