Maximizer/Robinson are the diffs. They use stock gear ratio. Where as if you were to use UE's diffs, the gear ration would be different and you would have to gear for it.
You said something about using the strobe slipper.
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Is the stock strobe sliper alright to use?
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The Strobe is way better than stock especially in a higher HP motor like the 7XL. Only set back is that you have to use the 51T mod 1 spur gear and you have to use mod 1 pinions.