I have tried to search the forum for this topic, but dont see any prior discussion on it. Has anyone installed Novak's front seal conversion into their SM420? See a few that had overfilled their trans. and had a "leak", Text from site below. Any thoughts or experiences appreciated. "The early SM420 transmissions (1947-1953) feature a necked-down retainer sleeve bore and screw-back threads to push oil rearward back into the transmission during operation; akin to a pump. This is in lieu of a neoprene seal as used in modern transmissions. This type of system is revealed by the presence of a dripper hole at 6 o'clock in the retainer tube, whose role it is to drip any escaped oil down into the bellhousing instead of towards the clutch disc. This early method works only tolerably well. Parking downhill with the engine switched off can be especially problematic. We've developed a clean way to fit the SM420 with a front seal. We grind a precision cylindrical seal journal into a customer's existing shaft. We then provide our billet steel SM420 front retainer and a neoprene seal. This has the benefit of providing an excellent seal at the front of the transmission, without sacrificing the flushing and cooling action of gear oil to the main input bearing. It also replaces the brittle, cast iron front retainer with a far more durable version. " http://www.novak-adapt.com/catalog/transmission/transmission_parts/sm420_parts.htm
