I replaced my 2011 Chevy Silverado 1500, 5.3L 6-speed, 3.42 rear end with a 2014 Silverado 2500 HD 6.6L diesel 6-Speed Allison, 3.73 rear end. Both trucks factory equipped with typical tow package. One of my boats is a 5,000lb on trailer Sea Ray cuddy. The 1500 pulled it just fine, but with...