With suitable prying tools, thin bladed screwdrivers, carefully pop the transmission arm off the wiper output shaft. Don't use heat, there is a much needed rubber grease cup under that transmission arm....dont' know if you can get replacements. The grease cup is the brown and blue rubber doughnut on the output shaft.
Under the dash, disconnect power and remove the three screws that hold the motor in place....it'll either stick darn tight or fall onto your face scratching yer glasses...be ready for both.
Here the tar like gasket goo stuck to the dash...good. On the 64 it stuck to the motor. Do NOT DESTROY THE GOO. You need it to seal the motor to the hole in the cowl....I have no idea what you would use to replace this if you destroy the goo. Remember, even in the 60s Goo, though in its infancy was found to be GOOD! Still is, specially Blu Goo.
Back to the bench, I scrape the goo from the 64 motor I'll be installing. I'll save this goo in a plastic bag case I need it in the future. The burning up 65 motor is on the right, its goo remained on the dash.
Remove the rear bearing grease cup from the 64 motor I'll be installing, pack it with grease and reinstall. Now the rear bearing will be greased by the flat portions of the output shaft pulling grease into the bushing and shaft.
