...the selector's tubular, welded on part,that actually slides the tranny gears,had broken off...the remaining shaft(that the selector handle screws into)easily slid out the right side of the case...the new selector,when attempting instalation from the inside of gearbox,is obstructed by that large gear on the uppermost,centrally located shaft(looking down into gearbox)...this large gear has a rounded shoulder that faces the rear of the machine....it has been running just fine otherwise just being left in one range or the other...this large gear(sorry,i havent been able to identify its name)has a smaller counterpart that slips inside it a bit,THAT one slides to the front of the machine easily...no home computer here,sorry for slow response time...