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Old 11-11-2017, 10:57 PM   #3
bigrigpardo
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Join Date: Sep 2008
Location: NEW MILFORD NJ
Posts: 1,453
Re: Center boring a GM transport wheel

Best way is to pull your brake drum off and measure the center hole in it. I am pretty sure it's 3.5 inches. You should be able to take them to a machine shop and have them opened up. But measure your back spacing. Most say you need 2 inch spacers to have the wheels fit in the wheel wells in the back without hitting.
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