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Gear ratio swap

Discussion in '1st Gen Tundras (2000-2006)' started by The tundy, Nov 6, 2018.

  1. Nov 6, 2018 at 5:55 PM
    #1
    The tundy

    The tundy [OP] New Member

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    Hey I was just wondering if anyone has ever put a higher gear ratio in their first gen tundras and what were the results? Reason for asking is my stock 3.92s are done for figured I’d just order a whole new rear axle and replace everything. Fast forward about a week and the axle came today they sent me the wrong one the paper said it’s out of a 2005 tundra with 3.62s in it (I didn’t even know they ever put anything lower than a 3.92 in tundras) basically what I’m wondering is if anyone knows how this truck would perform with a higher ratio like that. I’m not too concerned about running 10s in the quarter mile as long as the engine is not bogged that’s all I care about. I really don’t want to go through the process of returning it and having my truck out of commission any longer if I don’t have to. Thank you in advance.
     
  2. Nov 6, 2018 at 6:01 PM
    #2
    Darkness

    Darkness New Member

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    Never heard of 3.62, I would ask them to send the correct one asap. Gear ratios below have been run fine, never seen anybody fo the other way.

    3.91
    4.10
    4.30
    4.56
    4.88
     
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  3. Nov 6, 2018 at 6:13 PM
    #3
    Casper421

    Casper421 Adventure in a 1st gen

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    I agree with Luis. Only heard of 3.91’s and 4.10’s in 1st gens.
     
  4. Nov 7, 2018 at 6:00 PM
    #4
    bmf4069

    bmf4069 New Member

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    So how hard is it to swap gears? Front and rear? Or to add an lsd? And can you get an lsd for the front? I've never heard the front talked about.
     
  5. Nov 7, 2018 at 6:34 PM
    #5
    Thegr8punkin

    Thegr8punkin A God Damn Millenial/Sofa King Cool

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    Let’s put it this way, if you have to ask that, you shouldn’t do it....

    Try and get the right gears for the rear that match your front

    Gears alone are a pretty big task and something that will have your truck down for a few days of constant work, even more if you have a job other the being under your tundra

    They are also relatively easy to screw up if you don’t know what your doing...
     
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  6. Nov 7, 2018 at 7:13 PM
    #6
    ethan1911

    ethan1911 New Member

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    Take it to a shop to have the gears done. That’s the only thing I’ll ever have a shop do. It’s pricey but worth it if you’ve never done one.
     
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  7. Nov 7, 2018 at 7:14 PM
    #7
    bmf4069

    bmf4069 New Member

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    It's not something I'd attempt. But I would pull them out to let someone else do it. I'm just being curious. I like to know how things work. (I'm in engineering school). And I do have a full time job, so it would take me even longer.
     
  8. Nov 7, 2018 at 7:14 PM
    #8
    Casper421

    Casper421 Adventure in a 1st gen

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    This!
     
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  9. Nov 8, 2018 at 12:30 PM
    #9
    The tundy

    The tundy [OP] New Member

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    Im kinda new to working on trucks I’m more of a boat guy so I’m not all that familiar with some stuff. A lot of you seem to say you won’t mess with that stuff and just to take it to a mechanic. I’m just wondering what is it that makes it so hard? Don’t make fun of me it’s a legit question lol. I just figured it would be old differential out and new differential in
     
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  10. Nov 8, 2018 at 12:41 PM
    #10
    Thegr8punkin

    Thegr8punkin A God Damn Millenial/Sofa King Cool

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    So if all your swapping is the old center section for a new one, go for it! It’s a good way to start learning.

    I (like others) assumes you were talking about swapping the actual gear set, so taking the diff out, removeing all the bearings, the old ring and pinion (the gear set), then installing the new r&p, the reinstalling the diff.

    With setting up a gear set in a diff you have to make sure that you have all of it shimmed correctly to make sure that the r&p mesh properly, that is where the most people mess up, that is why I take my diffs to a buddy who has been doing diffs since before I was born,
     
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  11. Nov 8, 2018 at 12:45 PM
    #11
    The tundy

    The tundy [OP] New Member

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    Ohhhh ok yeah I wouldn’t wanna take it all apart myself I thought you guys were just talking about the center section now we’re on the same page
     
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  12. Nov 8, 2018 at 12:48 PM
    #12
    Atomic City Tundra

    Atomic City Tundra Old guy in training

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    If you are interested in it and are a "mechanical" type of person - even setting up gears isn't that horrible. It isn't the worst job I have ever done. Granted, I haven't done any Toyota gear setups, but I can't imagine that they are too terribly different from some of the stuff I have done. Maybe I am wrong. It does require some extra tools, but I have always been happy when I "had to" buy some new tools.

    Here are a couple of links for Ford setup stuff if you are interested. The Ford 9" is nice because of the preload adjusters vs. a shim design. Anyway, happy reading:

    http://www.billavista.com/tech/Articles/Gear_Setup_Bible/index.html

    https://www.ford-trucks.com/articles/ford-9-inch-rebuild-gear-setup/

    I imagine you could find some stuff for Yota's if you dug around enough. I just haven't ever messed with the gearing setup on any of my Toyotas - so I don't have any links for them.
     
    Last edited: Nov 8, 2018
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