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I differential works when opisite tires on an axle turn at different rates (ie. turning a corner the outside tire turns faster then the inside tire). a posi rear end locks up when one tire increases speed suddenly while to other is stationary or turning very slow. If your tires are different sizes from side to side then the differential gears ( spider gears) are turning all the time and will burn up as they are not desined to turn all the time and at high speeds. If you have smaller times then the diff wil lock up sooner and if they are much larger then factory it may not lock up soon enough.

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Q: How does tire size affect a posi rear end?
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