G's Raptor

[vanilla_gorilla]

I have the 6.2 and it has an abundance of power. The biggest trouble I find is that when getting after it in off-road mode, diff locked, 2WD and in "M" it is hard to electronically shift with the little buttons on the shifter and it is difficult to see the gear position on the front display. In Jarrett's truck with the 5.4 he has 3 gears to chose from on the shifter itself.

So when you say upgrading the gears are you talking about the differentials? Remember I am still very new to all of this so excuse the question but it seems to me that it already has a high gear ratio, hence the crappy MPG.

I too am very new to the off-road scene too, hence my rookie questions (Watch out BigJ and RPG next month in Reno as I pick your brains. )

Yeah, the trucks come stock with 4:10 gears in the diffs, and I know that when you switch to bigger tires (Normally for the lifted trucks going from stock to 35s this is true or needed) that redoing the gears will help with power loss. But i haven't heard from any of the guys running 37s if they have changed out the gears in their diffs to accommodate the increase in tire size.

But I agree with you, I too have the 6.2 and it's a beast, i have no complaints from the power plant.

 

[E63]

I too am very new to the off-road scene too, hence my rookie questions (Watch out BigJ and RPG next month in Reno as I pick your brains. )

Yeah, the trucks come stock with 4:10 gears in the diffs, and I know that when you switch to bigger tires (Normally for the lifted trucks going from stock to 35s this is true or needed) that redoing the gears will help with power loss. But i haven't heard from any of the guys running 37s if they have changed out the gears in their diffs to accommodate the increase in tire size.

But I agree with you, I too have the 6.2 and it's a beast, i have no complaints from the power plant.

Its all good. If I don't know the right answer, I will never BS. This is one of those cases. In my opinion, no need to change anything.

 

[torrin]

I too am very new to the off-road scene too, hence my rookie questions (Watch out BigJ and RPG next month in Reno as I pick your brains. )

Yeah, the trucks come stock with 4:10 gears in the diffs, and I know that when you switch to bigger tires (Normally for the lifted trucks going from stock to 35s this is true or needed) that redoing the gears will help with power loss. But i haven't heard from any of the guys running 37s if they have changed out the gears in their diffs to accommodate the increase in tire size.

But I agree with you, I too have the 6.2 and it's a beast, i have no complaints from the power plant.

I am a Jeep guy and I know a lot about gearing needs. I believe with the horsepower and torque the Raptor puts out, 4:10 gearing will serve you just fine with 37's.

The good news is, if you put 37's on and you don't like the power loss, you can either lower your gearing to 4.88's or something, OR Supercharge it. I plan on going the SC route myself.

 

[vanilla_gorilla]

Its all good. If I don't know the right answer, I will never BS. This is one of those cases. In my opinion, no need to change anything.

Good to know!

I am a Jeep guy and I know a lot about gearing needs. I believe with the horsepower and torque the Raptor puts out, 4:10 gearing will serve you just fine with 37's.

The good news is, if you put 37's on and you don't like the power loss, you can either lower your gearing to 4.88's or something, OR Supercharge it. I plan on going the SC route myself.

I figured it wasn't a huge deal since i haven't heard much if anything about the guys running 37s doing 4:88 gears. Most just do a tune, CAI, and exhaust. Thanks for the info!

37s are now on my list...lol!

 

[KaiserM715]

So when you say upgrading the gears are you talking about the differentials? Remember I am still very new to all of this so excuse the question but it seems to me that it already has a high gear ratio, hence the crappy MPG.

A lot of the mileage equation has to do with a lot of frontal area and a heavy wheel / tire package.

Yeah, the trucks come stock with 4:10 gears in the diffs, and I know that when you switch to bigger tires (Normally for the lifted trucks going from stock to 35s this is true or needed) that redoing the gears will help with power loss. But i haven't heard from any of the guys running 37s if they have changed out the gears in their diffs to accommodate the increase in tire size.

Mathematically, you would use a 4.30:1 when you upgrade to 37's. This would keep your overall ratio (tire size factors into this) the same as stock. For example: with the stock tires and gears, the engine is turning about 1940 rmp @ 70 mph. With 37's and stock gear, it would be 1820 rpm. With 37's and 4.30s, it would be 1910 rpm.

 

[E63]

A lot of the mileage equation has to do with a lot of frontal area and a heavy wheel / tire package.


Mathematically, you would use a 4.30:1 when you upgrade to 37's. This would keep your overall ratio (tire size factors into this) the same as stock. For example: with the stock tires and gears, the engine is turning about 1940 rmp @ 70 mph. With 37's and stock gear, it would be 1820 rpm. With 37's and 4.30s, it would be 1910 rpm.

So with 37's I have less torque in the low end, and I am going faster with less RPM, so that should improve mileage?

 

[Jake Y.]

well the logic is sound, but that doesn't take into account the change in load from the larger wheels and tires.

I'm running 4:56 gearing with General Grabber 37s for reference.

 

[Boss327]

well the logic is sound, but that doesn't take into account the change in load from the larger wheels and tires.

I'm running 4:56 gearing with general grabber 37s for reference.

2010?

 

[KaiserM715]

So with 37's I have less torque in the low end, and I am going faster with less RPM, so that should improve mileage?

Yes. As far as the mileage, yes, in theory, if you were to neglect the additional mass of the heavier tires.

 

[Jake Y.]

Yep 2010! And FWIW I love responsiveness and "get-up-and-go" that the gears, in concert with all the regular bolt-ons, give me. Though gas mileage is not something i particularly want to discuss ( ), That may be mostly a product of my heavy right foot.