Regear with 37s

Any regear options out yet?

 

I know on the 2.5 gen it is not that the power isnt there its just the pedal mapping that makes it feel like it needs it. Pedal commander and problem is fixed. the 3rd gen has more power BUT given its a turbo its going to suffer the same fate as the ecoboosts (my wife used to have one) when larger tires are put on meaning its going to spend more life in the boost and your mpg may as well have a boat anchor attached. Also will likely lead to a lower turbo lifespan since theyre spooling all the time. So imo it may be wise to regear for 37s in a 3rd gen if they have an option to get it back to factory specs.regear will be cheaper than a premature twin turbo failure. Ask me how I know.

In response to ops original question , no idea.

 

100% spot on answer. Everything you listed is my “why”. I’m adding weight as well with bumpers, drawers and camper. I tow occasionally but not as a general need. I’ve always referred my vehicles and generally use the o/d or highest gear compared to stock as a guide but not much if anything is out yet. For a ratio, whichever is closest to stock ratio when we do numbers. Thanks for the answer man!

 

For me , definitely

 

What is the stock axle gear ratio?

 

I believe the new 3rd gen is like 3.31 don’t quote me

 

Thanks. Yeah, I think 4.88s is the lowest (numerically) I'd run with 37's.

 

Yea that's the downside to a small turbod engine, is that weight and larger tires added get you into the boost in a hurry negating any benefit to the smaller engine in the first place. And if its always ringing itself out all the time to get going , the natural conclusion is lower turbo life and engine life as well, as good as toyotas engines are. I used to joke about my wife's ecoboost saying there's no "eco" if you're in the boost lol it's one or the other hahaha

 

Take apart a brand new truck. I run factory until it dies before I do that.

 

While I understand your I have no issues at the moment theory , I'd like to hear back of if your turbos are leaking oil out at 80k miles. Then it would be an intelligent discussion. By ringing out , I mean that the turbos are spooling prior to when they are from the factory causing unintended wear at higher rpms than what is intended from the factory. This indeed is happening regardless of your butt dyno telling you otherwise. I say butt dyno not in a asshole way but just in reference to"feel of the pants" kinf of thing. Whether or not it causes longevity issues is yet to be seen as I doubt your truck has enough miles to determine that.

 

I’m active in a Jeep wheeling community. I see a lot of guys ruin perfectly capable Jeeps by stuffing big tires under them without addressing proper gearing, drivetrain, steering and braking concerns. No way I would run 37”s on a stock Tundra.

Matt

 

Hey man I appreciate your response. I currently have a set of Toyo AT3 waiting on my wheels to ship. I’ve always re-geared ahead of any mechanical issues that may happen though. I totally understand your point of “ain’t broke don’t fix it” and subscribe to that theory myself with some vehicles. I’ve just never liked to run undergeared. It just causes issues , for me in the past at least, and would rather spend money to have it run like I want or close to OEM standards. I’m not trying to say what anyone else wants to do is wrong only asking if anyone has heard of gear availability or anything. A friend has same truck and 37s and I’ve driven and ridden quite a bit in it. It’s noticeable how trans shift point are different and take off is sluggish. Anyways, appreciate the positive reviews of how the 3rd gen handles 37s my man!

 

@Eurodriver you're only at 80-85 lbs per corner with 37s?

 

We will use my tires which are 265/60/20 @ 32.5 inches with 3.31 gear ratio. To stay out of turbos all time. I would think you would need at least 4.11 gears for 37" tires. If you stick with 3.31 you are going to stay in turbos because you are going to kill torque output of engine. If you took turbos away from this engine that is in Tundra it would be a turd. If they had not put turbos on this truck it would have to have 4.11 just to keep up with traffic because of how much it weighs. Not counting fuel mileage would be worse than earlier Tundra.

Not counting fact that you may need a different carrier to go from 3.31 to a lower gear ratio such as 4.11. I would consider maybe 35's instead. It would still hurt but not like 37's.

 

You’re correct, as far as I know, the differential deck height is 3.73 and down and 3.92 and up typically. Thanks man

 

If you are picky like me. 3.73 with 35's would probably be okay. Not counting 3.31's with 37's probably never would see 10th gear.

 

No clue how much the 18" steelies weigh, but the 20" LE wheels are like 37.5 lbs. The steel wheels can't possibly be much more.

 

Raptors with factory 37’s come with 4.10’s and have very similar transmission ratios. I dont think I’d go much more than 4.10’s as its already got nearly a 5:1 first gear.

Thats still shorter than a 2nd Tundra with 5.29’s. In fact the 3.31’s are comparable to a 2nd gen with 5.29’s. The reason the 2nd gen needs gears so bad is because of how obnoxiously tall its transmission ratios are.

 

I'm glad they got Transmisson ratio good in new Tundra.

 

If you want to ONLY offset the 37” tire, 3.88 rear end is enough (Proof: 37 x 3.301 / 31.5 or new tire diameter x current ratio/previous tire diameter). You probably want at least 10 percent lower to make up for the heavier tires, etc. 4.3 would be good but who makes gears for 3rd gen?

 

OEM Toyota 4.30 gears are available from foreign market Land Cruisers, which share the same 9.7” rear axle. The complete chunk should drop right into the Tundra rear axle. The front differential is a little up the air on how things will fit. The LC is AWD, it has either an open diff, or a locker option. The locker operates in a similar way to the 4x4 engagement on the part time Tundra… could be an easy swap by mix and match, or?

 

I talked to one of the aftermarket gear manufacturers and they some gears already in the R&D. They wouldn't tell me any specifics, but hopefully they'll have 3.90s and/or 4.10s in the works.

 

That is some good news The 37" takes away some of the torque
Please keep us updated if you are still in contact with them I called ECGS and there is nothing at this time
Thank you

 

I talked to East Coast Gear early this year and had gear sets available up to a 5.29.

Brad

 

I am pretty sure they are talking about second generation. Noting for 2022 and up.

 

I'll message my contact after Thanksgiving weekend. Hopefully he has some updates on the gears for the 3rd Gen.

 

I am debating between this and TRD performance kit. I tend to believe that a lower gear would be a better decision
Thank you

 

Yes

 

Thank you but I did not have to cut any body panels .
I have 1/2" spacer in the front that gives me 1" of lift and TRD lift uper arm that gives me a pretty aggresive caster
I had to cut that crash bump that was welded and remove the little bracket behind the felt
Even with aftermarked mud flaps and I am about 3/4 " of space left I did installed a small 1/4" spacer on the bump stop so , I lost about 1/2 up travel.
Before I installed the TRD upper arm, I was touching the sway bar at full turn. Not anymore.

 

I’d def be interested in new gears! I had a 2015 Tundra w/ 12” Bulletproof lift, 38’s, and Fab Four front bumper. Installed lift with around 5,000 miles on truck. At around 12,000 miles, the trans bit the dust! Toyota warrantied it on a “good faith” warranty. Basically, they said we will replace trans this time, but with the huge lift and tires, if it happened again they would not cover. After the repair, I installed Nitro 4:88 gears. It was a completely different truck after that!! I’d rather not go through the same with this truck, haha!