w00t692

4.10's with 35" tires is equivalent to 3.88 with 33" tires and 3.63 with 31" tires.

Essentially ford geared the raptor shorter than they really needed it to be with 35" tires on it, specifically so it felt peppier considering it's one of the heaviest models.

WarSurfer

Gen 1 Raptor
SCAB 5.4L, 320hp/390tq, 5900lbs, 4.10:1 gearing, 34.5" tires, 6spd trans
SCAB 6.2L, 411hp/434tq, 6000lbs, 4.10:1 gearing, 34.5" tires, 6spd trans
SCREW 6.2L, 411hp/434tq, 6200lbs, 4.10:1 gearing, 34.5" tires, 6spd trans

Gen 2 Raptor
SCAB HO3.5TT, 450hp/510tq, 5600lbs, 4.10:1 gearing, 34.5" tires, 10spd trans
SCREW HO3.5TT, 450hp/510tq, 5800lbs, 4.10:1 gearing, 34.5" tires, 10spd trans



If only there was some consistency in the data, some indication of which gear to use with 35" tires - some way for the engineers at Ford to give some indication of what gear to use with 35" tires. It's so confusing, we may never know the answer...

KingDeleted

Whats interesting is that as Ford increased HP and Torque their gear ratio remained unchanged. It’s as if HP has little to no effect on their gear choice. What’s more is that the truck kept on getting lighter as power output increased. Hmmm

sholxgt

Well, the good thing is that buying the tuner doesn't preclude him from re-gearing. As I said above, he will need the tuner to correct the trans shift schedule with the gear change.

No reason to not buy a tuner, flash the truck, and see what he thinks. If not enough, change the gears.

In my particular case, my truck with 3.55's, 34's, and the 5Star tune is fine. The tune definitely helped. With stock tune it was best to just lock out 10th at lower speeds and even 9th at in town speeds. With the tune, it is much better. It now drives fine around town without locking out any gears and, with the E-diff locked, still can leave two black stripes at will.

With a 3.31, I could envision needing to lock out 10th even with the tune.

w00t692

I mean i get their choice of 4.10's.

the difference between 31 and 35's is 12%. The highest gear you can get with still having stock 31" tires is 3.73. 35's are 12% up from 31's which have a 3.73 as the shortest gear option. 12% up from 3.73 is 4.17... so they stuck 4.10's on it.

2AF150GA

Cost alone justifies tuning the truck over re-gearing, Tuning the truck adds power (duh) and will be cheaper and easier to do. If you still feel like you need more then re-gear. I went from the stock 31's to 33's (SL) and I have a 3.15 rear and the 10 speed. Truck feels like a completely different animal. It will hold 10th at highway speeds and doesn't down shift as bad as one might think. Yet when I need some POWAAH it goes. It's quite fast (compared to stock) and I added an S&B CAI and got the tune revised and it got even faster on the top in. Tune, then reassess. OP, as I stated before, tune for 92 perf/tow if you go with 5* and be happy. No need to tune at 87 then run 92, might as well got the extra hp and tq since your running the gas for it.

Threeper88

I did both. My vote is to regear. Hands down.

Squid_FX4

Sorry for bringing up a relatively old thread, but do you mind sharing why? My truck is similar to yours (3.5EB, 6" Lift, 10 Speed Trans & 5* Tune) I'm currently running 35" tires and am toying with the idea of re-gearing to either 4.10 or 4.56 but as I do more research on the subject, I come across threads like these that do nothing but make me more confused lol. I'd like to hear your real world experiences since our trucks are very similar.

sholxgt

To re-iterate, the question should not be tune or gear. The question should be tune or tune and gear.

You can not fully take advantage of the gear change without a tune to adjust the shift schedule. Same can also be said for tire diameter changes. It's amazing how much better a vehicle drives when the ECM knows the correct tire height. The entire torque demand and shift schedule is based on knowing the rpm that the vehicle will see in each gear. Mess with tire height and/or gearing in the differential and you need to make the change known to the ECM. I'm not sure if it is still available for dealers via IDS, but it used to be something they could modify. If that option still exists, that would work just as well. If not, then you need an aftermarket tuner to make the changes.

I drove my truck for about a week with the 34" tires without a tune. The transmission was a mess!!! Lazy on every upshift and would then, sometimes, drop back down because it wasn't happy. Tune and it now runs perfect.

w00t692

The 3.5 ecoboost FEELS faster with gear, but actually goes slower generally because unlike the coyote it only has power to 5800ish rpms, and not 6250 like the coyote (6800 with a tune, 7500+ with manifold swap and cat delete). It has to shift too much.

^^ the shift schedule is torque based biased by an output shaft speed table. Based on torque and OSS it shifts. With larger tires you're inherently going to put your foot to the floor more so it's going to shift oddly because it didn't learn around those tires. Reset the KAM data before making that decision.

Go see if you can get your truck to click off a 0-60 in 3.18 seconds. That's what i did at the track and i have a 3.15 gear based on a 7.69 1/8 @ 93.28 mph

I cant' fault gear, though, it will feel peppier for sure, and feel "easier" to accelerate.