Most seals seem to fail because the shaft that is to be sealed has developed excessive (beyond spec) runout. A little exploratory looksee inside the case may be indicated, IMO. Get your new gasket enroute first, if you decide to go with that. I have found that a very light smear of non metallic (bearing friendly) anti-sieze on both sides of the gasket will enable you to crack the case in the future without having to buy a new one every time you have to pull it apart. I also use a torque wrench to impart an even load for the proper seal. Never had a problem with a drip.
