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Welcome to GMFS:rocking: With an 8.5" wheel, you will need 6" of backspacing for your wheels to tuck. My truck has a little over 3.5 inches of clearence at my tranny X-member, but it is not as big of a problem as you would think. I just recently got the 255/45 Toyos, and they are f'n badass. They get incredible traction in the rain and they are quiet on the highway. here is a pic of them on my 20"x8"s
 
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