86 250 rear gear help

i was given an 86 trx 250 (thats old school) the problem is the owner before me didn't change the rear diff. oil, so the water leeked in distrioded the bearings on the input shaft that turns the crown gear(to the point it wouldn't move). the problem now i have it mostly apart is how do you get the ball bearing and neidle bearing out of the housing? it looks like a 12 point soket inside,