PawPaw

Go with the 4.88's if you plan on running 37 or 38" tires later. I'd also upgrade the brake rotors, caliper's and pad's before running these heavy tires, especially in city driving. 9.75 rear in most of the late model truck's with the 5.4 4x4 model's FX4 and Lariat's.

love4f150

i already did the better rotors and calipers all around had to get new rotors and pads any way so i figured why dont i go big, MY MAIN question now is will the truck still drive better if i went with the 4.56 or 4.88s if i leave my 35/12.5 on their for a couple more months till i get the cash for 37s..
i believe im gonna go with the 4.88s front and rear and counted 12 bolts which was said its 9.75 not 8.8
thanks guys!

driver444

I want to just give you a bit of caution on running 37 or 38" tires (regardless of gear ratio) with an 8.8" rear axle if you do in fact have one, which I doubt if you have a 5.4.

There's a reason why the bigger engine trucks use bigger axles. The 8.8 is very strong for what it is, but not designed for tires that big. That adds tons of stress to the axle housing while accelerating. I've seen more than one set of bearing caps pop on 8.8" axles that had too much asked of them.

The 9.75 is considerably beefier. It should handle those tires without an issue.