Thread: Upgrade differential

Hey all, I currently have a 2010 F150 4.6L V8 3V 4x2 with 3.55's and I'm thinking about upgrading my differential to either a 4.10 or a 4.56 and I am going to buy a tuner for the speedometer and I'm currently running stock tires, may upgrade later down the road, no pun intended! And I'm wondering the key differences between the 2. What I'm looking for is accelerating, city driving, highway driving, towing, off-roading, mpg, and anything else I might need to know! Thanks!

You may find this useful:

Gear Calculator: Use Our Gear Calculator for Proper Gear Ratios

Originally Posted by wernotalone2k25

Hey all, I currently have a 2010 F150 4.6L V8 3V 4x2 with 3.55's and I'm thinking about upgrading my differential to either a 4.10 or a 4.56 and I am going to buy a tuner for the speedometer and I'm currently running stock tires, may upgrade later down the road, no pun intended! And I'm wondering the key differences between the 2. What I'm looking for is accelerating, city driving, highway driving, towing, off-roading, mpg, and anything else I might need to know! Thanks!

If you had a 4X4 and were going to throw 35's on it I'd say 4.10 or 4.56. However with the smaller 4.6L and 4X2 3.73 will do just fine. If you're considering mpg as a factor don't even consider 4.10's or 4.56's, they're intended to put more power on the ground without care for how much fuel that takes. Ford usually put the 3.55 with the 4.6 because it's a good match for its power and towing rating. I've thought about switching to 3.73's in my '05 4.6L, but that's it. It would help with acceleration and towing, but I'd see a drop in mpg's slightly. Also the 3.55 is fine for off-roading, it's standard with the FX4 Off-road Package, but again you have a 4X2. This is just my 2 cents though. Also make sure when you choose a tuner that it has the option to reset for larger gears, I've seen many that can reset tire sizes but I've never noticed a feature for gear ratios (granted I was never looking for that option though).

Tbh. If your not changing anything on your power plant. I would just stay where u r. If u insist on a lower gear. Your fuel economy will change for the worse. However. A 3.73 will make u jump as I'm guessing u want to. With that being said. Guess what happins after that? Stuff breaks lol
If u were going rock crawling and bigger tires yada yada yada. I'd go 4.56. If you put a supercharger on and were slayin silverados. I'd say 4.10. But for what u want. 3.73 will do the job far better than anything else. Good luck

5Star tuned.....

Originally Posted by Jersey_Joe

Tbh. If your not changing anything on your power plant. I would just stay where u r. If u insist on a lower gear. Your fuel economy will change for the worse. However. A 3.73 will make u jump as I'm guessing u want to. With that being said. Guess what happins after that? Stuff breaks lol If u were going rock crawling and bigger tires yada yada yada. I'd go 4.56. If you put a supercharger on and were slayin silverados. I'd say 4.10. But for what u want. 3.73 will do the job far better than anything else. Good luck 5Star tuned.....

My father has the 3.73 in his 5.4L V8 and I love the acceleration, that's what I want!

3.73 with the 5.4 is amazing

Originally Posted by anaheim_drew

I had 3.73 with the 5.4 and stock tires (30.5") and it was good. But when I went to 32.9" tires it was not. So I changed to 4.10 and it was then amazing.

my stock tires are 32's, and it's still amazing