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37s with stock gears

Discussion in 'Performance and Tuning' started by mixwells, Jun 19, 2017.

  1. Apr 17, 2020 at 8:13 AM
    #91
    texasrho83

    texasrho83 DGAF#1

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    I would think 37s and up necessitate the upgrade.
     
  2. Apr 17, 2020 at 8:15 AM
    #92
    osidepunker

    osidepunker OsidePunker

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    I think it was like $2k or $3k when I checked a few years ago. Camburg has some wilwood brakes on their website. 6 piston front, 4 piston rear. Should fit 17" wheels

    If anyone upgrade let me know how that goes for you
     
    texasrho83[QUOTED] likes this.
  3. Apr 17, 2020 at 8:25 AM
    #93
    texasrho83

    texasrho83 DGAF#1

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    Once my warranty is out, I plan on going to 40s. I'll save money by doing a body lift and put that money towards a brake upgrade.
     
  4. Apr 17, 2020 at 8:33 AM
    #94
    osidepunker

    osidepunker OsidePunker

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    TRD big brake kit is another option, but you have to run 20" wheels
     
  5. Apr 17, 2020 at 8:52 AM
    #95
    texasrho83

    texasrho83 DGAF#1

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    I have always run 20s
     
  6. Apr 17, 2020 at 8:53 AM
    #96
    texasrho83

    texasrho83 DGAF#1

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    What's the TRD kit go for?
     
  7. Apr 17, 2020 at 8:57 AM
    #97
    osidepunker

    osidepunker OsidePunker

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    Check around. I think its like $3k for front brakes. I dont think they have an option for rear

    and the front are only 4 pot. but you get a larger diameter rotor
     
    texasrho83[QUOTED] likes this.
  8. Apr 17, 2020 at 9:06 AM
    #98
    ZPMAN

    ZPMAN 2nd place is the 1st looser

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    Sounds like your all set for tools except I think you forgot the most important thing, BEER?
     
    blackoutt[QUOTED] and texasrho83 like this.
  9. Apr 17, 2020 at 9:10 AM
    #99
    ZPMAN

    ZPMAN 2nd place is the 1st looser

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    With supercharger and 35s bettor braks should be my next upgrade.
     
    Last edited: Apr 17, 2020
  10. May 7, 2020 at 5:32 AM
    #100
    blackoutt

    blackoutt YEAH BUDDY!

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    Does anyone make a solid pinion spacer kit for the 9" reverse clam front diff? Finally got the 4.88 sent back and 5.29 received so I'm itching to get started and thinking about any other parts I may need/want while I'm in there for this job.
     
  11. Dec 17, 2020 at 9:27 AM
    #101
    INT.EGRATED

    INT.EGRATED New Member

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    With the 5.29 being available now do y’all say go for 5.29 instead?
    And are the BDS 6”+ lift kits mandatory for 37s? I’m not worried about bmc. I’m coming from the tacoma world where lifts over 3” will break something when offroading or crawling. Would the bds kit be fine for offroading and have full droop and tuck?
     
  12. Aug 12, 2021 at 7:42 AM
    #102
    14crewmax

    14crewmax New Member

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    Just a thought, I runs 34s with a bully dog tuner and my truck acceleration feels great it had lost some power when I went to 34s but I feel like I gained that touchy pedal back with the tuner. Has anyone here just replaced the rear with a LSD or locker and left the stock gearing???
     
  13. Aug 17, 2021 at 4:43 PM
    #103
    Ghillie93

    Ghillie93 New Member

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    Hey everyone, just ordered the 6" lift from RC and and have a question about the width of tires. My wheels are 22x10 with +10 offset. I'd prefer 37's over 35's but notice that width on the 37's range from 12.50 to 13.50. Can anyone chime in if either width would allow better turning radius or could cause problems with fitment? I've searched quite a bit and can't find a clear answer regarding wheels with positive offset. The truck already has the body mount chop from a previous setup and is an 09' 4x4 with the factory tow package from yota which came with 4.30 gears if I'm remembering correctly. Thank You guys!
     
  14. Aug 17, 2021 at 4:53 PM
    #104
    Hbjeff

    Hbjeff New Member

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    if you’re opening it up, replace the gears too unless you plan on going back down in tires size someday. The labor cost to do gears+ locker wont be much different than just the locker
     
  15. Aug 17, 2021 at 4:56 PM
    #105
    crewmaxlmt

    crewmaxlmt How dare you!

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    35’s on my truck with 4.88’s and the gps still says that I am going faster than the speedo. I would go 5.29’s with 37’s.
     
  16. Aug 17, 2021 at 5:04 PM
    #106
    snivilous

    snivilous snivspeedshop.com

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    That's because the gears don't affect the speedo, the speedo pulls data from the abs sensor and not the transmission.
     
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  17. Aug 17, 2021 at 5:08 PM
    #107
    crewmaxlmt

    crewmaxlmt How dare you!

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    Did not know that. However, I did not notice as much of a difference as I thought that I would with the regear. I would definitely go lower if I was running 37’s.
     
  18. Aug 17, 2021 at 7:22 PM
    #108
    14crewmax

    14crewmax New Member

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    It’s actually way more because I have to open up the front as well
     
  19. Aug 17, 2021 at 9:13 PM
    #109
    crewmaxlmt

    crewmaxlmt How dare you!

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    Yes, the front is almost double the labor of the rear. Although, I do now have an E-locker up front.
     
    Hbjeff likes this.
  20. Aug 17, 2021 at 9:47 PM
    #110
    TravisJr

    TravisJr New Member

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    I’m running 5.29’s on 35s, and it feels perfect to me. Lots of pedal response, and still good at highway speed. I wouldn’t even consider anything less for 37s or above. I learned my lesson with a woefully under-geared Jeep once - I’ll never make that mistake again.
     
  21. Dec 2, 2021 at 6:24 AM
    #111
    wexttxco

    wexttxco New Member

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    35s on stock gearing here, pain in the ass on the interstate or hills, fine while driving around town or when wheeling. Excited to gear up!
     
    14crewmax likes this.
  22. Apr 11, 2023 at 7:37 PM
    #112
    Luke_Skywalker

    Luke_Skywalker New Member

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    I have a hard time believing that a change in ratio from 4.30 to 4.88 will make that noticeable of a difference. Especially if you get a light 37 like a KO2 that are 64.8lbs, and combine that with some lighter wheels you could end up only netting like 2 more lbs per corner. Maybe its the rolling resistance from the 2" inches in width?

    I want to run 37s, but don't want to re-gear. If I did, I wouldn't go for anything less than 5.29 but that's just me. I went from 3.73 to 4.56 on my Fj and I could feel a difference, but not nearly as much as guys i know who run 4.88s. I figure the same applies for the Tundra but what the hell do i know.
     
  23. Apr 11, 2023 at 7:39 PM
    #113
    Luke_Skywalker

    Luke_Skywalker New Member

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    What are your RPMs on the highway at 60-70-80 mph? just curious. One of the reasons I didnt gear my FJ higher and voted for 4.56 over 4.88 was because of how tall it would have ran on the HWY. I would love to have 4.88s for 75% of my driving, but where im at in socal its like 2 hours to get to good wheeling and those highway miles at 2800-3k RPM would be awful. Im steady at 2300-2500 on 35's with a heavy rig. Feels like a good compromise.
     
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  24. Apr 11, 2023 at 7:45 PM
    #114
    Luke_Skywalker

    Luke_Skywalker New Member

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    So question for you big tire folks / understand this better than I do folks. If a 315/70/17 weights 65.2lbs and a 37/12.5/17 weights 64.8 why will the 37 make your truck feel THAT much more like a dog compared to the 35? Just trying to understand.
     
  25. Apr 11, 2023 at 8:09 PM
    #115
    reywcms

    reywcms New Member

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    I’ve got stock 4.30s in mine and truck feels fine. I’ve given a few people a ride and it definitely not a priority for gears yet. @RegGex would agree lol The wheel and tire combo definitely makes a difference. My previous 35s and 18s weighed more than my current 37s and 17s. When I do regear it’ll be 4.88s. The blower helps lol
     
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  26. Apr 11, 2023 at 8:16 PM
    #116
    texasrho83

    texasrho83 DGAF#1

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    Ya think?! :rofl:
     
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  27. Apr 11, 2023 at 8:30 PM
    #117
    RegGex

    RegGex I noticed you copied my beard

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  28. Apr 11, 2023 at 8:57 PM
    #118
    rruff

    rruff New Member

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    8% higher revs than stock with 37s and 5.29 gears. 14% lower with 37s and stock gears. I wouldn't bother with 4.88 if you are going to do it.

    It's all gearing.... but you are more than fixing that with the regear. Do you really need it? Some say yes, some say no. It basically just makes 1st gear kinda tall. Some say the ECU gets confused but I never noticed that on mine at all with 35s. My previous truck had the 115hp 22RE, so I think I'd have to fit tractor tires before I thought it was a dog.

    Tire and wheel weight (within reason) aren't enough of an effect to notice contrary to popular belief. Also, larger diameter and wider tires tend to have less rolling resistance, not more. More aero resistance though.
     
  29. Apr 11, 2023 at 10:03 PM
    #119
    Hbjeff

    Hbjeff New Member

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    The gearing is far more than just about weight. Its mechanical advantage. I believe that lever effect is infinitely more important than weight. Your engine would MUCH rather turn a heavier stock diameter tire than a lighter 37 inch tire
     
  30. Apr 12, 2023 at 5:37 AM
    #120
    T-MAC

    T-MAC New Member

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    Does anyone know if 2nd Gen gears are compatible with 3rd Gen Tundras? I've been asking gear shops and they have no answer yet, and they have no gears specifically for the new Tundras.
     

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