WarSurfer

The answer is no. Even with the 10spd, baseline for 35s (per the Raptor) is 4.10:1.

If you can negotiate and get the 3.73s without paying more, I'd try that 1st.

PerryB

The 10 speed has a pretty low first and second gear so it'll still launch and accelerate pretty good. I think what you'd notice most is hunting in the upper gears at freeway speeds. You'll get away with it a lot better than us poor slobs with 4 speeds, but it won't be ideal. For that you need to get back to the mathematical equivalent of the trucks original configuration, or a touch lower to accommodate the extra rotational mass. For that, 3.73 would be better and 4.10 would be best.

SteveLord

I have a tuned 2013 5.0 and 34" tires at 66lbs each. Went from 3.55 to 4.11 gears and recommend it for those specs. Sometimes I wonder if I should have went a little more. That's why I wish there was a 4.3ish option.

PerryB

4.30 would be nice.

Havyek

I've never geared my F150s, but coming from Jeep/offroad side I'd say it's also always best to go to a lower gear ratio off the bat then slightly undergear.

I.e. if mathematically you need a 3.8ish ratio to get back to stock, go with 4.10 or 4.56 (if 4.56 is an available option) than the closer 3.73.

You're engine might be at slightly higher RPMs, but it won't be working as hard to spin undergeared tires.

GrasslandHVAC

I noticed no change going from a 235/70/17 p rated garbage hankook (30 lbs) to 235/80/17 E rated ko2 (47 lbs) but also tuned. However, I went from a 31 to 32 and kept the rolling resistance minimal keeping it skinny, and 32 inches is actually a stock tire size on pretty well almost every other f150.
I'd not want to risk wide 34 or 35s on 3.55 or even 3.73 gears.
Just saw a post a few pages back suggesting there are no gear options for the 8.8?? There goes the idea of 4.10s for me.
I was hoping to do a true trac in mine if I keep it (open difs make me angry)

Since the raptor guys are running lockers and huge tires I assume the 9.75 is beefy enough to handle pretty well anything?

WarSurfer

It's a stout rear for sure. The weak link is axle tube thickness. If you truss it, it will take almost anything you throw at it.

DezertNoob

I hear good things about nitro gears, thats what I went with front and rear. 4.88 gears w/ 37s gives me an effective ratio right around 4.18. Stock was 3.55 and day one of tire install I dropped it off for gears. A few thousand hard miles later and no complaints. Still cruises 80-85 all day on the freeway to the dirt and I avg about 10.2 mpg

sdmartin65

I know this is a subject in the off road section and my truck is more pavement use, but what the heck I'd figured to jump in with .02. My truck is a 95 302 supercharged that is a real clean randomly driven. It started out with 3.08 gears, went to 4.10 then down to 3.73 and finally settled out with 3.31. I run a 31" tire and the problem I was working to solve was the 4spd auto shifting decent in town and on the highway.

As was mentioned in the first post of the thread an over/under drive unit would really be the best way to go, matched with the correct gears of course. Switching the gears was inexpensive but one of those was outside the budget for this particular truck.

Dredd75

About how much are you guys getting charged in labor to regear? I'm gonna shop around but wanted to get an idea of what the average is.