The seal is a napa 11800. Install it at the carrier. Yes, remove the two piece shaft, on the pumpkin side of the vac housing is a hard plastic piece the old shaft rides on, that should be removed. You can make a plate to cover the vac fork actuator, I left all mine in so I have the 4wd indicator. The fork will slide left to right when engaged in 4wd but it doesn't hit the one piece shaft.