you may have to shim the diff if you look at this pic its the bits in red that need shimming it pushes the gears closer to give more resistence and it makes your gears last a bit longer the washers shoudn`t cost that much you could try the front diff in the back aswell and see if thats makes any difference once you get new clutch bell http://www.hpieurope.com/showimage.p...4/86014_15.jpg