Ok so i was messing around with my xmods and i had stage 2 drift motor with soft tires and whenever i would turn the tires had a way of slipping off the wheel so i well, glued the tires on the wheel so i could drift like mad. Shortly after this my car started going REALLY REALLY SLOW but the motor was doing max revs. When i got my car off the ground and turned one of the wheels the other wheel didnt turn which means something is slipping differential wise. So today i bought the AWD kit cuz it comes with another back differential. I put it in and well still doesnt fricking work, tried over and over added grease everything it just is fricked up.