I got burned by one one of those products before....ended up costing me $800 in a transmission rebuild.
While the product may help re-vitalize the rubber in the seal, it cannot repair cracking nor can it repair the groove cut into the yoke. Personally, I would get accustomed to the leaking oil, keep an eye on the level and a small jerry can full of oil on the back, and milk it though the season until I could pull the xmsn and do it right. After the transmission repair, pour a bunch of engine shampoo into the hull, let it sit for a short bit then hose the heck out of the hull with the front wheels raised slightly on blocks. Open up the rear hull plugs and let the good times flow. The oil will return to the earth from whence it came.
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