Power mods on Sierra 1500 CC with 5.3L
I have an 04 GMC Sierra 1500 crew cab with the 5.3L engine and 3.42 gears. The previous owner added 20" wheels and tires and a flowmaster muffler, otherwise the truck is stock. My Outback 30BHQ is a...
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The 20's are what's killing you.
Only true if the overall diameter was increased as well. A lot of trucks offer 18 or 20" rims but have the same tow rating and gearing because there is no difference in the overall diameter. The 20s will be lower profile than the 18s to keep them the same.
