My truck came with the 3.15 gears and an open posi. I'm an acceleration junkie and need more gear. Who sells 3.55 or 3.73 ring and pinions for these trucks as well as a decent limited slip differential? Anyone around Austin/Houston/San Antonio wanna trade rear axles?

 

Since you have an eco-boost you may be satisfied with the 3.55. I understand the eco's are pretty quick and the torque is great. Plus 3.55 may net you a little more hwy mileage. 3.73 is a great all around gear for a truck if you keep it at 70 on the freeway otherwise you will see a little decline in mileage. If you tow anything definitely go with the 3.73. If you are going to lift the vehicle and/or go bigger tires you will need to gear 4.10 or above, alot of guys here run 33's and lifts with 4.56, but I am not sure about the eco setups.

 

33's and 4.56's are ridiculous. Towing or not.

My truck is a 2wd so it won't be getting a lift and I don't tow. The 3.15's in this truck just aren't fun. They'd be great if someone was looking for a great highway cruising gear but I'm not. I'm looking for acceleration and pep. 3.55's would be the ideal gear as I think 3.73's with this small of a tire will have the engine turning to many rpm's on the freeway.

What rear end is in these trucks (dana, sterling, corporate, etc) so I can try and track down some gears. Or hopefully someone local will see this and want to trade complete rear ends which would be the easiest.

 

the difference between 3.55 and 3.73 is only 100rpms

 

I have my OEM 3.55 ring and pinion. Out of my 2007 f150 xlt just sitting in the garage in the box from my 4.10 yukons I replaced them with. Due to my 305/30/26 tire size.They have about 20k on them . If interested pm me I'm sure we could work something out. Either way good luck.