Aggiestro

Need some advice on a gear swap for my 3.31 4x4 EB. I have the stock 20" wheels but planning on adding a 2" level and 33 or 34" tires. What would be the optimal new gear ratio for this? I don't do much towing, mostly just hwy to work driving. What cost would I expect from a dealer install, and will this effect my warranty? Is there any new programming that will need to be done?

rdkev

From what I understand, the 3.31 is better for fuel economy and highway driving... the higher the numbers the more it is designed for towing. I did a 2 inch level and 35 inch tires on my 2013 supercrew ecoboost with the 3.55 rear end and didnt notice too much of a difference so i dont think you would really either... idk. i could be wrong...

Aggiestro

Thanks for the input. Anyone done a gear swap on an ecoboost?

EcoboostKev

It wont be cheap with a 4x4. Keep in mind you need to swap the gears in the front and rear. Then i guess it's just a reprogram to get the speedometer accurate again. It shouldn't void warranty if you have a Ford dealer do the work.I'm guessing $1500-$2000 if you bring to the dealer though. I would leave it alone, the torque of the Eco will have no problem turning 33"-34" tires even with 3.31 gears. But you will definitely feel it in the mpg department.

Aggiestro

Would mpg be better with a 3.73 and larger tires than a 3.31 and larger tires, at hwy speeds

Vizsla

My 3.31, 305/65/18 eco has a lifetime average of 14mpg with screw 6.5 bed 4x4 with a leadfoot. Runs great, fries tires at will, and has towed 6k+, and cannot complain. No gear hunting, just smooth linear power. If I had intentions of towing more or frequently higher gears would have been appropriate, but I want to play on the strip with it, and in the end I feel the 3.31 will work good in time....

davefx2

It won't be cheap. I had a quote of 1800.00 from 3 different dealers. I have a 2 wheel drive. So 4 wheel would be considerably more. Front and rear have to match.

maplelakeduckslayer

You really aren't going up in size by much at all...I say just do the level and tires and determine if theres a need to re-gear after. I would say you probably won't need to.

PRNDL

I would do a 3.73's. Now i am used to non turbo v8's. for all i know, the EB and all its monster torque will do just fine with 3.31's.

pat247

iTrader: (1)

Use the force, Luke.......translation.......Use selectshift to lock out gears when not needed.