Put this on the pinion and put the dog bone end into it. Cvd end can go on the motor shaft.
http://www3.towerhobbies.com/cgi-bin...?&I=LXJBE9&P=7
Mike sells the diff output shafts that can be used to put the stock silder style driveshafts on the hb diffs.
http://www.rc-monster.com/proddetail...d=RCMdiffshaft