Originally Posted by Dodge Guy
Yes it does. with nothing more than a gear ratio difference, a tow rating can go up 4k lbs depending on the truck! even the GCWR will increase. obviously the GVWR will not change. however on some trucks the GVWR can go up.
it`s all dependent on the manuf., and how the truck is built.
You missed my point; I wasn't clear. My 2500 might have come with a couple different axles and the ratings will reflect that, depending on which truck I buy. But, what goes into the rating is what the factory does; it might not be only gears. Brakes, etc., factor in. The OPs Suburban came with those gears and changing gears to something not offered by the factory, or in fact offered by the factory, will not change what the factory rated the truck to tow. Granted, common sense says it should tow more weight, but when we were talking rating, and a shade tree mechanic doesn't get to rate anything. If it had stickers, we don't get to change the stickers