Your WAY off. First off fitting the 9 1/2 up front, good luck. But no matter what size you decide, on the front wheel, you need to deduct 3.25 or 3.00 inches from the wheel measurement to get your outside location correct. So in simple math, if you run a 8" wheel, you need a 4.75 to 5.00 backspace. If you run a 8.5" wheel, you need a 5.25 to 5.5 backspace. If you only want to go straight and not turn, usinf a 9.5 wheel, you would need a 6.25 to 6.5 backspace.
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Frank Serafine
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