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Old 02-28-2011, 09:50 AM   #4
LilD
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Join Date: Oct 2009
Location: Tucson, AZ
Posts: 186
Re: Rear end gears for 72 c20

Maybe its not the rear end. I looked at/test drove a 71 GMC when I was truck hunting and the owner had replaced the throttle cable with one out of a newer truck that was just short enough to not let the throttle open up enough to get past 45 mph.
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