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37" tires = RE-GEAR

Discussion in 'Wheels & Tires' started by JTP, Jun 2, 2017.

  1. Jun 2, 2017 at 8:06 AM
    #1
    JTP

    JTP [OP] The Big Black Moose

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    Did a little road trip hauling research pulling a pretty light weight boat last few days.

    Boat and gear was around 1500#s and we had the bed loaded down with another 500#s or so of gear.

    I am defiantly going to have to do the re-gear for towing anything heavier running these 37's.

    Gas mileage suffered more than I would like and top end pull was just not there like it should be.

    Was not horribly bad but pulling anything heavier is going to be tough going without the gear change.

    Running around town or down the highway is fine with out them but if your going to work / pull with it then the gears are a must.

    There was a lot of discussion of having to re-gear on the big tires, its all true. :thumbsup:

    Just my 2 cents.
     
    Last edited: Jun 2, 2017
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  2. Jun 2, 2017 at 9:15 AM
    #2
    osidepunker

    osidepunker OsidePunker

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    I saw a definite power loss going to 35s. MPG is whatever.

    37s with 4.88s will get you slightly better than 4.30 and 32" tires. I will definitely regear when I do 37s. It will be nice to get back to stock range
     
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  3. Jun 2, 2017 at 9:25 AM
    #3
    TheBeast

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    re-gear necessary when switching to 35" or 315/70 ? thinking of upgrading my 33"
     
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  4. Jun 2, 2017 at 9:27 AM
    #4
    1UPPER

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    I'm getting my 4.88s and limited slip done in two weeks. I'll let you know how it pulls after with my 37"s.
     
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  5. Jun 2, 2017 at 9:28 AM
    #5
    osidepunker

    osidepunker OsidePunker

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    Its not a necessity. Just depends on if you are willing to deal with the small loss or not
     
  6. Jun 2, 2017 at 9:40 AM
    #6
    JTP

    JTP [OP] The Big Black Moose

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    Yea I am now wondering if this might help running 35's too.

    My truck came with 35's but I never pulled anything with it but I could tell at highway speed not pulling anything the difference between the 35's and 37's.

    As mentioned you can run without the 4:88's but its going to be WAY BETTER with them.
     
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  7. Jun 2, 2017 at 10:35 AM
    #7
    Eclipsed & Floating

    Eclipsed & Floating Over it.........

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    I'm not towing but carrying a load intermittently and have recently noticed what feels like gears sticking with 35s, only 10,000 miles, and an empty bed.

    would you be able to notice gears sticking or slipping with 35's?

    I don't really care about a little power loss, nor MPGs. I just don't want to do damage when i'm loaded down, nor when i'm not
     
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  8. Jun 2, 2017 at 10:42 AM
    #8
    osidepunker

    osidepunker OsidePunker

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    I'm not sure what you mean by sticking or slipping. Mine shifts normally, it just felt like I lost a little power when I switched to 35s
     
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  9. Jun 2, 2017 at 10:44 AM
    #9
    JTP

    JTP [OP] The Big Black Moose

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    Your in a completely bad situation if you are getting "sticking or slipping gears". I don't think that the "gears" that we are talking about changing that are taking power from the drive shafts and sending it out sideways through the axels to the wheels through the differentials are what your having an issue with.

    There is no way that they could 'slip' or 'stick' unless the gears are somehow damaged.

    Your transmission might be down shifting more often at higher speeds when climbing a hill running bigger tires but I doubt seriously that you have a gear issue.
     
  10. Jun 2, 2017 at 10:47 AM
    #10
    JTP

    JTP [OP] The Big Black Moose

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    Its is sounding to me that even 35" tires could use 4:88 gears. I learned that the newer Tundra's come with 4:30's probably to take bigger tires and turn better at highway speeds with a load.

    My truck came with 4:30's as apart of the tow package.
    No tow package comes with 4:10 gears.
     
    Last edited: Jun 2, 2017
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  11. Jun 2, 2017 at 10:48 AM
    #11
    Stewie

    Stewie New Member

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    What do you mean by sticking or slipping?
     
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  12. Jun 2, 2017 at 10:53 AM
    #12
    JTP

    JTP [OP] The Big Black Moose

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    Slipping or sticking GEARS comes with loud bangs, grinding noises, truck feeling like its getting kicked in the balls and jumping and ALL KINDS of other weird "oh shit" somethings really fucked up and its going to be expensive feelings AND the truck probably won't roll forward or backward for long.
     
    Last edited: Jun 2, 2017
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  13. Jun 2, 2017 at 11:19 AM
    #13
    Eclipsed & Floating

    Eclipsed & Floating Over it.........

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    It's not that
    It's like they are holding longer when not in tow/haul mode than expected, but normally when going uphill. I live in the high rockies so no avoiding hills here. It could be an anomaly and i only noticed it yesterday. I'll keep an eye out. Probably just my brain playing tricks
     
  14. Jun 2, 2017 at 11:21 AM
    #14
    JTP

    JTP [OP] The Big Black Moose

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    If you went up to 35's the transmission is waiting "holding" longer to shift.
     
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  15. Jun 2, 2017 at 11:22 AM
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    Eclipsed & Floating

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    I've been on 35s for 4 months though...never noticed it before yesterday
     
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  16. Jun 2, 2017 at 11:24 AM
    #16
    JTP

    JTP [OP] The Big Black Moose

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    Check transmission fluid level (and for leaks)
     
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  17. Jun 2, 2017 at 9:51 PM
    #17
    zackbremer

    zackbremer New Member

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    https://www.tundras.com/threads/4-30-gears-front-and-rear.10468/

    i dont think toyota changed their drivetrain for the newer gens? do you have a link to this info, just trying to confirm. 2017 should sstill be 4.10(non tow package) 4.30s for tow package..this is for the 5.7v8 not sure about the 4.7L
     
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  18. Jun 2, 2017 at 9:58 PM
    #18
    JTP

    JTP [OP] The Big Black Moose

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    2017 5.7 comes with 4:30 gears
     
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  19. Jun 2, 2017 at 10:12 PM
    #19
    zackbremer

    zackbremer New Member

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    ^^correct, in the post i quoted you typed "4.20" gears i now assume this was a typo
     
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  20. Jun 2, 2017 at 10:24 PM
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    Joeshaker

    Joeshaker New Member

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    You'll have to take it to the dealership to get the trans fluid. Our trucks don't have a dipstick.
     
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  21. Jun 2, 2017 at 10:26 PM
    #21
    JTP

    JTP [OP] The Big Black Moose

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    Didn't know that. Will have to take a look at the book to see how it can be checked.
     
  22. Jun 12, 2017 at 3:48 PM
    #22
    payyourtoll

    payyourtoll New Member

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    what brand 4.88s? And which master install kit did you choose?
     
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  23. Jun 12, 2017 at 4:25 PM
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    1UPPER

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    G2 gears. IMG_8068.jpg
     
  24. Jun 12, 2017 at 4:57 PM
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    sdhq_offroad

    sdhq_offroad New Member Vendor

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    Pretty much every Tundra 2010+ (with the 5.7") is all standard with the tow package. 35's do rob a little bit of the low end torque, but unless you are hauling and pulling heavy loads it won't affect performance. In my case, it helped me not spin the tires off the line as bad. :burnrubber:

    We use the Nitro gears here and typically either do the Auburn Limited Slip or an ARB air locker.
     
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  25. Jun 12, 2017 at 5:03 PM
    #25
    sdhq_offroad

    sdhq_offroad New Member Vendor

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    I don't mean to jack the thread, but it is somewhat gear related. We built this Single cab with a custom 5.5" bed. Supercharger with AEM water methanol injected.


    Performance

    Drivetrain

    • Level Ten Valvebody
    • Level Ten Torque Converter
    • 4.88 Gears Front And Rear
    • Auburn Limited Slip Rear Differential
    Wheels & Tires


    2014-tundra-single-cab-short-bed-frame-chop-icon-vehicle-dynamics-method-wheels-toyo-mt.jpg
     
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  26. Jun 12, 2017 at 5:07 PM
    #26
    1UPPER

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    Which shocks and suspension did you guys go with?
     
  27. Jun 12, 2017 at 5:10 PM
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    sdhq_offroad

    sdhq_offroad New Member Vendor

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    Just Icon Coilovers/Upper arm. 2.5" rear piggybacks. No add-a-pack.
     
  28. Jun 12, 2017 at 5:14 PM
    #28
    1UPPER

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    Did you install the Icon bump stops?
     
  29. Jun 12, 2017 at 5:22 PM
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    Dustydirt19

    Dustydirt19 Hoghead

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    What does an lsd do and why would I want one after regearing?
     
  30. Jun 12, 2017 at 5:32 PM
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    TheBeast

    TheBeast The Beach

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    that looks like a very capable off road platform
     

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