QT50 gears on a PW 50

pull out the ring gear from the qt50 setup. press the shaft out. do the same for the pw50 set. then install the shaft in the qt ring gear and reinstall. then just use the entire qt50 rearend if your pw. If you really have to have the black pw rearend you will need to make a tool to remove the pinion gear. a bolt with a 19mm head will work. you can double nut it or weld a nut on the other side to remove the thing over the pinion gear. pop the gear out and reinstall the new one. some new grease won't hurt.

pressing axle out

unless you have a press you should take it to a machine shop. NAPA pressed mine for $5...