For a belt drive conversion the expensive option is to get hold of the Option House conversion kit which are ridiculously overpriced.
The cheap way is to just take the diff cases and belt out of a used short wheelbase Mid and sell the rest of the parts off, the rest of the buggy wears out before the belt drive does. Just swap the belt and diff cases over. The full conversion includes a small pulley to take up the small amount of slack in the belt, but it isn't necessary.
Also don't bother spending a fortune on a hard final pinion, use the Ultima plastic final pinion. You need the pinion and counter gears from the UM-1 Ultima gear set and the layshaft from UM-5 gear shaft set.
My bashing Optima has been running with these setups for years with a 13 turn brushed motor in it.
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