Not sure if you've solved this yet, but a buddy of mine had one of the rear CVD pins come slightly out when he was changing wheels...it ended up binding up the whole drive train pretty badly.

To find it, we removed the pinion to make sure it wasn't the motor, then we removed the belt to isolate front and rear transmissions (might find that one of your transmission case screws is rubbing on the pulley...)

That might help isolate where you are getting your binding...