I am working on a 650. I would like to change the seal that is on the shaft that goes from the lower part of the transmission that spins the drive shaft to operate the 4wd front axle. This seal is in a narrow recess in the bottom of the transmission housing. It is much too small for a standard seal puller. I would say that the cavity is about 3 inches wide and 6 deep. Any advice on how to do this?