Novak even includes factory-style felt yoke seals that install between the yoke and seal housing. Normally we run a bead of silicone inside the yoke to prevent any 90W weeping through, but this time we're trying a simple trick that we came up with. Yup, that's an ordinary garden hose O-ring that we got at our local hardware store for a couple of pennies. Hopefully it'll keep leaks at bay without the messy cleanup next time we have to pull a yoke off this thing. Once it's all together, spin the outputs to make sure the gears spin freely and shift nicely. Then pop the inspection cover back on, slap it back in the Jeep, and fill it up with some good-quality 90W gear oil.