You may need a thin wall socket to get on the pinion nut, Be very careful not to crush the the crush sleeve any further than it all ready is, takes a touch. any other questions Email me at sgs350@earthlink.net
I would mark the nut and the pinion gear and then count how many turns it took to come off so you can put it back exactlly right so it wont crush the crush sleeve anymore than it already is.