Everyone I know with a Tundra with the 5.7L V8 is very happy with it, plenty of power and reliable, but that payload is waaay too low. I know you are looking for a 3.73 rear end, but I tow with a 3.42 rear end without many issues. I have the GM 6-speed with the 5.3L V8, which does not have anywhere near the down-low torque of the EcoBoost.
In order to get the max tow package I would have had to upgrade my trim level and wait 2-3 months. I went with the 3.42 because they payload was "enough" (1750# vs 1900 for max tow) andso was the tow rating (9400#) and I saved around $5k.
The 3.42 rear end with the 6-speed has an equivalent 1st gear ratio as the old 4-speed with a 4.10 rear end!
Originally Posted by saml
Thanks for the replies! Great information. We're running into a bit of a snag. Having trouble finding (used) f150's with a 3.73 gear ratio for sale. We found a Toyota tundra 5.7L V8. However it only has a payload of 1295. Jayco's website said to take 12% of loaded camper and subtract that from the available payload. If trailer was loaded to 6000lb that would take 720lb away. With only 575 left... subtract 475-500 for 2 adults and 2 kids we're left with less that 100lbs for cargo. Why such a low payload on these trucks? Is anyone pulling with a tundra??