On a Ford, you want at least their 3.55 rear end and preferably 3.73. GM has a 3.42 rear available on most truck and SUV models with a 3.73 available on the 1500 series pickups as part of their Max Towing package.
I drive a 2010 Tundra and it tows well. The numerically high 4.3 rear end is offset by the overdrive gearing in 5th and 6th gear. For towing, you put the transmission in 5 for optimal performance. I can't claim the gas mileageis great - like above - but it's not bad for a 5800 pound truck with almost 400 HP.
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