I'm having some rear end binding which I think is being caused by the slipper. I just tore apart my diff and added 1 traxxas axle shim to one of the sun gears because I'm having the slippage/clicking problem discussed a few pages ago. Everything moves fine and smooth and fine until I put the slipper and spur on, meaning it's not the diff. Could you help me out? There's no screws screwed in to far or anything.

Thanks,
Dan