It's likely a previous owner has done this just to run a slightly bigger spur gear,
can remember with one of them (sorry, can't remember which size now) it could slightly rub the chassis on hard jump landings when the bearings were well used.
If the slipper mechanism is missing then it will be running the Street Weapon touring car layshaft/spur gear, it was a fairly common mod played with years ago, i think it was to do with saving battery power by having more direct drive
wouldn't recommend running without a slipper with modern more powerful brushless systems and higher grip tracks, it would definitely eat through belts!
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Mr F.Chimp
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