Left side lugnut studs

Older mopar's weren't the only ones. A lot of the old Brit cars have left handed threads as well. The Brit cars used knock off's, and the theory is that on the driver's side, if the thread is the standard right hand the inertia of the spinning wheel can loosen the knock-off. So, the threads on the driver's side were made left hand so that the inertia of the spinning wheel would tighten the knock-off, just like on the driver's side. But the knock off's are basically a single lug nut located right at the center of the axle, so there's more relevance to the theory because the wheel and knock-off rotate on the same axis.

Now, with lug nuts the theory gets a little harder to follow because the lugs aren't at the center of the axle like the knock-offs are, so the lugs don't rotate on the same axis as the wheel. But that's were the idea came from, the theory would go that if the lugs were normal right hand threads the tire rotating in the opposite direction could have some loosening effect.

There was a "study" done on it back in the day, which concluded that if RH lugs are used on the driver's side of the car and not tightened properly they can actually loosen. If they're properly torqued though, nothing happens. Check out this article (it's a real article, not sure why the link shows up like that)

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