Inasogard

Hey all,


Anyone out there done any gear modifications to the new 2015's?


I ordered my truck with 3.73's and with my 6" lift and 35" tires, its not to bad, but I am leaning towards going with 4.56's.....Looking for anyone who might have some info or experience here.


Thanks

03Mach1

That's a pretty steep jump from 3.73 to 4.56. Do they make 4.30's for the f150 axle?

I went from 3.55 in my Mach 1to 4.30's and it was huge jump. I don't even have to use 1st gear under normal driving, 2nd gear has become my 1st gear. I realize different vehicles and tranny but still a big jump.

Inasogard

My 2007 F150 had the same lift and tires and I have 4.56 in it and it was excellent. Just not sure if they are even available yet.

MGD

FWIW:

"One last key weight saving feature found under the 2015 Ford F150 is the revised 8.8” rear differential, which has been beefed up inside to allow for much heavier towing loads. This allows Ford to use this smaller 8.8” differential rather than the 9.75” unit, shaving 35lbs from the 2015 F150."

==>http://www.torquenews.com/106/ford-b...weight-savings

MGD

Inasogard

I don't believe that is for all 2015....actually I am positive, due to having just looked on my rear differential and seeing it marked with the 9.75 unit.


Appreciate the info though..

Smidgy

Your 07 had totally different trans, you probably won't need 4.56 gears.
Your old truck trans ratios
The gear ratios are: 1st: 2.84:1 2nd: 1.55:1 3rd: 1.00:1 4th: 0.70:1 Rev: 2.32:1
Your new truck trans ratios
The gear ratios are: 1st: 4.17:1 2nd: 2.34:1 3rd: 1.52:1 4th: 1.14:1 5th: 0.86 6th: 0.69 Rev: 3.40:1.

There is a lot different gear ratios here, notice how steep reverse and first are? Not to mention that some come with 32.1 stock, 35's not a big jump

Z7What

Some 2015s have 9.75" I know that for a fact.

Also i would suggest 4.56s with 35s!

Wayne

WTF150

Your mustang also had tires that were about 30% shorter in overall diameter than his 35's which adds to the torque multiplication.

Smidgy

His first gear would have been about 40% taller which subtracts the torque multiplication as well.

WTF150

Good call I thought the Mustang 1st gear was shorter than that. Im seeing 3:38:1 for 1st gear on the Tremec TR 3650 vs 4.17:1 on the truck. The Mustang 1st gear is 19% taller, not 40%.