A repair sleeve for any application can be somewhat expensive. Here is what the pros do when reconditioning the yoke systems on any transmission, axle, or transfer case in order to prevent any lubricant leakage...
Once the case/assembly is all back together, the input or output spline is carefully cleaned of any and all lubricant, we use contact cleaner for that. Clean the yoke in the same manner, all parts must be clean and dry.
Apply a very tiny bead of high temp rtv at the point where the shaft exists the bearing race. This is the only place I ever use an rtv product in any work I do.
Then we slide a shim of some sort down over the spline, something around 1/16" or so but the actual thickness is not critical. I use the shims for the side bearings on a d44 axle, those normally come in large sets of multiple sizes and we always have a bunch around. Apply another tiny bead of rtv on top of the shim.
Then install the yoke. Do not use the felt (or rubber) spline gasket. Lay in the last application of rtv on the spline/yoke interface, then install the thick washer and nut, and torque it.
Doing this will prevent lubricant from bleeding past the spline and relocate the actual yoke surface to a clean point that will not interfere with the seal lip.
If any imperfection is present on the yoke surface that will come in contact with the seal lip, the seal will be destroyed in an instant.
