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What am I risking NOT re-gearing?

Discussion in '3rd Gen Tundras (2014+)' started by joem1cha3l, Dec 25, 2017.

  1. Dec 25, 2017 at 5:08 AM
    #1
    joem1cha3l

    joem1cha3l [OP] New Member

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    Running 35's on my 2016 4.6L. Besides the thing being slower out of the hole than a constipated turd, what am I risking? Transmission problems?

    I really want to go to 4.88's but dropping 3-4k is just really tough to swallow.
     
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  2. Dec 25, 2017 at 5:20 AM
    #2
    PlatinumPro

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    the acceleration and low-end towing power will suffer. keep in mind these are already lacking in the 4.6. nobody says you HAVE to go 35's. personally i couldn't handle losing anything and 2.5" of tire would end up pissing me off far more than it'd make me happy.
     
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  3. Dec 25, 2017 at 5:30 AM
    #3
    joem1cha3l

    joem1cha3l [OP] New Member

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    Yah, I’m living the power loss everyday. I just want to know if there are any real potential problems. I already have the 35’s and 3.5” lift
     
  4. Dec 25, 2017 at 5:54 AM
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    T-Rex266

    T-Rex266 T-Rex Staff Member

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    Probably additional stress on the trans and rear diff
     
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  5. Dec 25, 2017 at 6:05 AM
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    gosolo

    gosolo “The .com stands for communist”, Dale Gribble

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    @joem1cha3l
    Exactly what Sean said.
    If you want a way to quantify it, think of it like this:
    Suppose your truck was completely stock, how big a load of rocks would you be hauling around to equal the feel you have now? This is the equivalent stress to the engine and drive components. The Tundra is strong enough to handle it. Do you want it to have to?
     
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  6. Dec 25, 2017 at 6:08 AM
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    BakNBlk2014

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    Don't know about potential problems but most guys on here only re gear from the 4.30 to the 4.88 for 37s. F150 run a 4.10 and Ram 1500 3.55 I think. Higher ratio allows for more towing and low end torque. I would say you will be fine pushing 35s imho. I run 35s on mine 4.5 lift and the 5.7 is strong with plenty of power. The 4.6 is probably your biggest issue. If you have tow haul mode just use that all the time. Better shift points and throttle response.

    https://www.edmunds.com/car-buying/how-to-choose-the-right-axle-ratio-for-your-pickup-truck.html

    Maybe this will help. Merry Christmas. This forums getting me thru the work day. This and prime video. Lol
     
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  7. Dec 25, 2017 at 6:47 AM
    #7
    619Tundra

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    I actually ran 35s on my 2004 crew max with 4.7L V8, 6 inch suspension lift and never regeared. I bought the truck new and it went straight to the shop to get new suspension, and 17x10 rims with 35" BFGs. The speedometer read 3.6 mph off. I put 300,000 miles on my truck (which actually is 318,000 miles because of the tire size difference) and never experienced any problems. These engines run forever. I still have that truck and runs smooth.
     
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  8. Dec 25, 2017 at 8:27 AM
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    Grey Wolf

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    It's not helping mpg/ low end torque either. A bit much for the 4.6L. Always go large with engine first imho.
     
    Last edited: Dec 25, 2017
  9. Dec 25, 2017 at 8:31 AM
    #9
    BakNBlk2014

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    My new favorite Christmas story
     
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  10. Dec 25, 2017 at 8:55 AM
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    blue16

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    If your not driving it hard you shouldn't be hurting anything. The Brakes will wear a little faster but still not a big deal. New lower gears will help get you better fuel economy and performance
     
  11. Dec 25, 2017 at 9:03 AM
    #11
    Prostar 190

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    I run 35's also still has plenty of power. Mine is a 5.7 though.
     
  12. Dec 25, 2017 at 9:13 AM
    #12
    BakNBlk2014

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    Yup. 5.7 is a beast.
     
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  13. Dec 25, 2017 at 9:17 AM
    #13
    tmart

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    What I don’t understand is there are guys with GMs and they run 35-37s on the stock 3.56s I believe they are. When they talk about regearing they only go up to 4.10s a lot of the time. But tundra guys insist it’s mandatory to go to 4.88s on 37s but a Chevy on 37s with 3.56s or 4.10s is just fine? I don’t get it
     
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  14. Dec 25, 2017 at 9:34 AM
    #14
    831Tun

    831Tun IMA BasTRD

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    Wouldn't the transmission be the other part of that equation as well as engine displacement? Not something I know a lot about.
     
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  15. Dec 25, 2017 at 9:55 AM
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    BakNBlk2014

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    I believe what they are doing is reproducing the "factory" feel of torque and shift points with the new bigger tires. The increase from tundra 4.30 to 4.88 is .58 and GMs 3.56 to 4.10 is .54 so about the same half revolution increase on the driveshaft per 1 rotation of the wheel. Science.
     
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  16. Dec 25, 2017 at 10:12 AM
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    tmart

    tmart New Member

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    But wouldn’t that imply that the GM motor puts out more power thus needing less of a gear ratio than the tundra to get the same stock feel on larger tires? It’s all kind of confusing to me
     
  17. Dec 25, 2017 at 10:44 AM
    #17
    Grey Wolf

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    Just remember, Chevy/GMCs advertised mpg's are based in part with the 3.56 ratio. Wouldn't hurt Toyota to upgrade the Tundra tranny at some point like everyone else.
     
  18. Dec 25, 2017 at 11:11 AM
    #18
    jc153

    jc153 Speed-ish Glamper

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    Regearing when going with bigger heavier tires is always a good idea but not required. I don’t believe you’ll notice much if any loss in reliability.
    That being said, personally I’m regearing after going from a 34” to 35” tire. The loss in power in my 5.7 is noticeable and annoying to me.
    But to each their own. Not everyone feels the need or wants to budget for a regear.
     
  19. Dec 25, 2017 at 2:04 PM
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    tmart

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    I’m just wondering how bad it would be with 37s and the stock 4.30s. I have 35s now and I can tell the difference from stock but it’s just fine for my uses, I don’t hardly ever tow and barely drive the truck to begin with.
     
  20. Dec 25, 2017 at 2:11 PM
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    14burrito

    14burrito New Member

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    Your missing the joy of driving IMHO, even more so from a 4.6

    Its not necessary, but neither is a lift, large tires, lights, etc .... NOTHING necessary.

    Its like having sex.
    Sure, with a condom, its still sex...but regearing would be like sex without a condom - so much better!

    Merry Christmas
     
  21. Dec 25, 2017 at 6:34 PM
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    Cuzican

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    It's an absolute turd. I thought nah, I don't drive hard enough to worry about re-gearing. WRONG! You can do 37's on stock 4.30s, I'm doing it now, but it sucks and so does 5.7L at 11.6 MPG(corrected).
     
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  22. Dec 25, 2017 at 6:46 PM
    #22
    tmart

    tmart New Member

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    That sucks, I’ll probably wait to regear and upgrade to 37s on my next truck then. I plan on trading my 08 in about 2 years for a newer one I can keep for 6+ years at least. Don’t want to pay all that cash for gears and tires to just trade it in
     
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  23. Dec 26, 2017 at 9:36 PM
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    the_midwesterner

    the_midwesterner New Member

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    None, yet....
    Negative. It’s all about ratios, which includes transmission speed ratios. All this is factored into calculated loads with dynamic testing on multiple type of scenarios.

    Your torque converter may hate you...

    Something that no one else has posted is that your torque converter is sacrificed by doing this. Adding bigger wheels and tires is all handled by the torque converter during take-off, cruising speeds, flex lock-up, etc. if the torque converter has to work harder to compensate, this equates to heat. #1 killer of transmissions: heat. Does this mean your truck is gonna break tomorrow, nope. It will wear your flex lock-up clutch faster though and the fluid breaks down quicker if you maintain higher temp ratios. This is all assuming that the stock Tundra trans coolant system can’t handle the heat load. It’s very possible that it can, which would effectively make my argument moot except for the lower fuel economy. I have an inkling that it doesnt though.

    If you look around, there is a guy on here running 40s on stock gears and he’s been complaining of trans temps and other issues related to them. Even having to go as far as adding extra fans, coolers, etc. This would all be fixed with gears.

    The entire workload of couplings and decoupling is handled by the torque converter. The reason this is relevant is because as the engine spins, the fluid is transferred and it spins the transmission side of the TC, if you have bigger tires but stock gearing, your truck is working harder to move, hence the lower fuel economy. Once you get into cruising speed, this effect is lessened when the converter locks up, but the mass, tire diameter, and rotational friction of the bigger tires all still play a part.

    The way to fix this is gears. Period. There is a reason I run 5.38s with 40” tires and I have a GM motor/trans combo in my jeep.

    Moral of the story, is that if you are contemplating it, then do it. Your truck will thank you. Otherwise run as is, especially if you aren’t wheeling it. I’m currently running 35(ish) tires now on stock gearing and I HATE it. ARB lockers and 4.88s are in my near future.
     
  24. Dec 27, 2017 at 3:03 AM
    #24
    joem1cha3l

    joem1cha3l [OP] New Member

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    Great post Luis. Yeah, Im running the 35's on stock gearing and I hate it too. I live in Upstate NY and dont have anywhere to off-road so its a pavement queen unfortunately. Are lockers a must when I do a re-gear if I literally never off-road with it? I know now would be the time to do it since I have everything open, but I'll never have this thing off road. Thoughts?
     
  25. Dec 27, 2017 at 5:03 AM
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    Berettafan

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    Had an '06 for about 11 years. It was, IMO, a better built and better engineered truck in all respects for light duty work. i'm not sure I'd assume the 3rd gen will be better or even as good.

    OP I'd for sure regear if you're keeping the truck long term. I'm not sure why regearing isn't prevalent in Tundra circles. it surely is with Jeeps although the HP you are working with in a Jeep is much less. I went from 3.08 to 4.10 in a Jeep TJ with 33's and gotta say it was money very well spent. my feeling is a lot of what you see done to Tundras is about looks at the expense of feel/driving experience. What Toyota does better than other brands in trucks is the driving feel. Why give that away so you can look like every other redneck at the Walmart? Regear and enjoy what you paid for!
     
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  26. Dec 27, 2017 at 5:38 AM
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    BakNBlk2014

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    I highly resemble those remarks. How did you know I shop Wal-Mart. #notregearing35s
    20171219_134306.jpg
     
  27. Dec 27, 2017 at 6:21 AM
    #27
    SullyMoto19

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    I'm also running 37s on stock gears in my 5.7. The biggest thing I've noticed was the obvious MPG drop lol but other than that, yeah it's slower. It'll run when I need it too, but acceleration takes a pretty good hit. I throw it in tow mode when I need to move haha I'm not one to burn the rubber off the tires though, why spend 2k+ on tires to do burn outs? RPMs run higher as well, sweet spot seems to be around 50-55. 65+ and I hang around 2200rmps and higher. Getting around 10mpg right now, and it's my daily

    35s shouldn't be a problem..
     
  28. Dec 27, 2017 at 6:52 AM
    #28
    the_midwesterner

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    None, yet....
    Lockers are not a must when regearing, it’s just the best time to do it. Gear installs are a pain in the ass and fairly expensive to do, so it’s one of those things you want to do only once. You don’t have to get lockers though. Whole bunch of guys on here are running a rear lsd only when they regear.

    I’m an ARB guy and prefer to be able to choose when to engage/disengage traction at will. For the rest of the situations, that’s what traction control is for.

    Also, if you do regear, check out these guys: https://eastcoastgearsupply.com

    I have purchased a ton of stuff from them and they are good guys with great customer service. Also, cheapest I have found for a full regear with lockers. If you ship them your diffs, they will set the up and ship them back and a VERY reasonable price.
     
    Last edited: Dec 27, 2017
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  29. Dec 27, 2017 at 7:22 AM
    #29
    csuviper

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    This
     
  30. Dec 27, 2017 at 7:33 AM
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    trayday

    trayday New Member

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    If you do decide to buy. I just paid $1299 for 4.88's shipped for the front and rear sets from Rockridge4wd and an ARB locker from Carid, best prices I was able to find.20171217_115316.jpg
     
    Last edited: Dec 27, 2017

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