i've run my sx3 with no front drive in 4wd class after breaking the front belt and it wasn't much different, i did still have the diff and shafts in though.
either way, maybe if a new rule is required it should be for 2wd only transmision parts required to drive the rear wheels are allowed.
that should rule out leaving diffs in the front, propshafts or belts ect but allow the gearbox housing (empty) to still be fitted at the front for mounting reasons.
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