leaky WD45 engine

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   I've had an oil leak on my WD45 since I purchased it.  It seems to be getting worse so I've decided to finally do something about it.  There's a pretty steady drip where the engine meets the torque tube.  Initially I assumed it was the oil pan rear arched seal, so I dropped the pan, cleaned everything up, got all new gaskets for the pan and reinstalled.  Didn't make a lick of difference, other than now that everything's clean, I can see the drip path a little better.  It looks like it's dripping down between the face of the clutch housing and the rear main bearing cap, then onto the oil pan gasket and down from there.
So now I'm thinking it's most likely the rear crank oil seal.  I see that you can replace the lower half of the seal without too much effort.  I really don't want to get into pulling the engine off to replace the whole crank seal if I don't need to....has anyone had luck fixing this sort of leak by just replacing the lower half of the seal?

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