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Unlikely. Here's the short course... an open differential only differentiates (allows one side to coast while the other side gets power) when one tire has greater traction than the other. With an open diff, the tire with the LEAST traction gets the power.

With a limited slip, as you apply power (generalizing for simplicity) the clutches tighten up and apply traction to both tires to a certain extent.

The easiest way to tell is jack up both tires and spin one. If you have an open diff, the other will spin in the opposite direction.

If you have mud/ice/sand put one tire on pavement and one tire on the slippery stuff. If you move without hesitation, you're sporting the limited slip.
 

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You absolutely would have a 2 tire spin in gravel... you have relatively equal amounts of traction. An open diff isn't 1 wheel drive... equal amounts of traction gives you equal balance between tires.

Its only when there's a difference between tires traction OR tire speed (think a corner when they're not moving at the same speed) will the open diff differentiate.
 
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