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Two concerns

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I'm not aware of anything on the outside that would indicate the ratio. I've never checked one but I found the following instructions which should work for you.

Check differential ratio

Scott
 
Depends on your goals, and on the offset of your wheels.

I'm running 205/55-15 on 15x5.5 TR6 wheels, and they just barely fit under the rear fenders, with possibly some very light rubbing on hard turns/bumps. They are also substantially shorter than the stock tires, so the speedometer is not accurate and the ride height is lower. (But the speedo would be off anyway, since the DPO installed 4.1 gears without changing the speedo head to match.)

But I really love the improved handling, so I'm willing to deal with the other shortcomings.
 
Thanks for all the help. I am continueing to solve the problems but have recently learned that my Tach is also incorrect.
 
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