904 tailshaft bushing R & R

No. You can remove the ext housing with the trans in place. You have to remove the driveshaft, unbolt the trans mount and remove the crossmember (support the trans with a floor jack while doing this) then remove the trans mount and under it you'll see a steel plate about 1/2" wide by 3-4" long that has 2 large Phillips screws holding it in place. Take that off and it exposes the snap ring that secures the ext housing to the output shaft. You also have to remove the speedometer cable and speedometer pinion and adapter and take out the bolts securing the ext housing to the main case. Get a new gasket to replace the one between the main case and ext housing and a new O-ring for the speedo pinion adapter. Once the ext housing is unbolted you get to have fun getting that big snap ring I mentioned earlier that's under the mount to let go. If you have a really big set of external snap ring pliers it helps a lot. It can be done with two large flat tip screwdrivers if necessary but it's not fun. Replace bushing and rear seal and assemble in reverse order