dont bother saying im a noob and should use the searchbar I am way ahead of you and didnt find anything.

now I have a Team Losi XXX-NT sport that I just pulled out of my closet and I think I messed up the differential on it. I loosened the differential screw too much and now the rear wheels are not moving in unison and the slipper doesn't catch on anything it just slips. Any one know how I can get this problem solved?