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#7: 09-30-2009, 03:28 PM
wpmarky's Avatar
Title: vroom vroom
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Location: NorCal
Car: 5MT LGT Wagon- HTA68 + e85
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Your tires need to be within .25" circumference of each other to prevent your diff from frying.

If you only replace 2 tires, the new ones will have less RPM's than your older tires since the circumference is bigger. Your open differential will sense that, and will try send power to the tires it thinks are slipping (rotating faster). Since your new tires will always be bigger, your diff will always be 'working', and may lead to overheating and frying your diff.