Traded the Tahoe in on an Ecoboost
What a difference. The Tahoe was more for fuel economy than towing. All of about 12.5 mpg It had the 4.8 with 3.23 gears. And a second gear that seemed about 8000 rpm. The F-150 3.5L Ecoboost is ...
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Congrats on your truck! Don't worry too much about the gear ratio, the wide ratio of todays 6spd transmissions almost makes the rear end irrelevant. The 6R80 has a 1st gear of 4.17:1, so even with a 3.15 rear end, your first gear is still lower than the old 4spd was with a 4.10!! The rest of the gears in the 6R80 are spaced very nicely with 4th being a slight underdrive at 1.14:1 instead of direct 1:1, which is like being in direct with a lower rear axle. The torque of the ecoboost will make up for the 3.15, and it will help your unloaded mpg. Enjoy your truck!
