I'm going to buck convention and suggest you use the gear diff and control slippage with the slipper clutch, call me the weird one but I just don't think a differential based 100% on the friction between tiny steel (or carbide or ceramic) balls and a very very smooth, flat piece of metal. you can't really run the diff loose without burning it up from all the slippage, but if you set it tight enough to not slip, it's quite likely that it will be tighter than you really want it for optimal traction. on dirt, this probably doesn't matter quite as much since the inside rear tire will just slip a bit to make up for the diff, but at the same time there's the shock loads the diff will be put through when landing from jumps. just something to consider
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