I tow my Jayco hybrid with a 2012 Chevy Silverado with the 4.8 V8 and 3.23 gears. It does just fine in Florida where it's flat. The owners manual says I can gain 2000 lbs. towing capacity changing to ...
I have 4:56's in my 2000 2500 Silverado , (6.0l 4 speed)it originaly came with 4:10', but I went up to 33 inch tires and that took away some power, My rear end is essentially a 4:15 now, couldn't be happier, also, I can tow in Drive pretty easily where you would normally be in 3rd on flat ground...Super engine breaking though, I have 240,000 on my original brake's! and they should make it to 300,000 easily!