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32 front 33 rear?

Discussion in '3rd Gen. Tacomas (2016-2023)' started by Arti941, Jan 31, 2020.

  1. Feb 1, 2020 at 6:47 AM
    #21
    Speedfreak

    Speedfreak Member in poor standing

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    4wd transfer cases are designed to put power out equally to the front and the rear driveshaft. This simply means that they are locked together and spin at exactly the same rate. So this means that the pinions in the front and rear diff spin the same speed, and because your front and rear gear ratios are the same, the axles spin at the same speed.

    Now here is where tires come into effect, they are bolts directly to the hub or axle flange and therefore spin at the same speed as the axle shafts. Now if they have the same radius they will travel down the road with little issue, but if you have 2 different radii, you run into issues. Your front wheel will have a radius of 16 ( 32" tire ) and the rear will be 16.5 (33" tire ). Not a big deal until you calculate the circumference of each tire. The 32" will travel 100.53" every rotation ( 630.26/mile ) while the 33" will travel 103.67" every rotation ( 611.17/mile ). So when everything else is trying to spin at the same speed and then the tires don't want to spin the same speed because of a different size, something has to break. This can be traction to the smaller tires or something in the in the 4wd system. Basically something had to break. And it might not be traction everytime.


    This might sound funny but tires are another gear ratio. A smaller tire is easier to spin and would be a in increase numerically in gear ratio where a larger tire is harder to spin and a decrease numerically in ratio.

    Now I can't say for all, but the backhoe I worked on years ago was hydraulic drive, not direct drive. This gave the ability to run different sized tires front and rear.
     
    ColoradoTJ, dan33410, Chew and 2 others like this.
  2. Feb 1, 2020 at 6:52 AM
    #22
    Arti941

    Arti941 [OP] Member

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    Thanks for the kind feed back. Again, I was not aware of this and if the people on here think it’s a dumb question then I feel sorry for them. I forget, they know everything.
     
  3. Feb 1, 2020 at 6:57 AM
    #23
    Speedfreak

    Speedfreak Member in poor standing

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    Now this is something that will work on an AWD system but it is not something I would recommend. There is a differential in the transfer case that allows the speeds to vary when cornering. The front tires and rear tires travel at different arcs in corners making a speed difference. The centre diff is built to compensate for this. Now what will happen when you have different sized tires front and rear is a constant differential action. Some of these centre diffs have clutch packs in them to vary power front and rear that are aid in limited traction situations. When there is a difference in speed these clutches burn up, the fluid heats up and starts to shear and solidifies. This may take time but it will definitely increase the longer you run the different sized tires.


    Another issue is modern electronics. The ABS and TCS both rely on wheel speed to work correctly. If you artificially change the wheel speeds with tire size these systems can go haywire, trying to brake and slow down wheels it thinks are breaking traction by spinning too fast or releasing brakes thinking wheels are locking up.
     
  4. Feb 1, 2020 at 6:58 AM
    #24
    TuRDLYFE

    TuRDLYFE Well-Known Member

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    I'm at a loss for words, OP. If you lift the front and back equally, then take 1" overall diameter off of the front tire, you'd add 0.5" of rake to the truck. That and it would look like a wannabe top fuel car. Ill advised to run it in 4WD like that (transfer cases are not the same as torque-vectoring center diffs that you are used to/i.e. 4WD ≠ AWD) then throw in wheel speed sensor issues and you're affecting the TCS, ABS, and you... you get the point.

    [​IMG]
     
    Last edited: Feb 1, 2020
  5. Feb 1, 2020 at 7:01 AM
    #25
    Steve Urquell

    Steve Urquell No Pants

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    Yeah these front and rears are pretty locked in when in 4WD vs an AWD rig. You find out just how much when turning with 4WD engaged as they will try to plow the front tires.
     
    Arti941[QUOTED][OP] likes this.
  6. Feb 1, 2020 at 7:02 AM
    #26
    Arti941

    Arti941 [OP] Member

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    Thanks everyone. Damn , it looks like I triggered some with this question.

    look, I’m new. Just bought my first truck. Trying to learn, that’s all. I appreciate everyone’s feedback though. Really! Thanks.
     
    Last edited: Feb 1, 2020
  7. Feb 1, 2020 at 7:09 AM
    #27
    Chew

    Chew Not so well known user

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    Trucks generally have rake for stability, and so when the bed is loaded, the bumper isn't dragging. So if you lift both ends the same amount, yes, you'll have a larger opening. I'd keep the truck look, and keep it proportional.
    GL
     
    Arti941[OP] likes this.
  8. Feb 1, 2020 at 7:09 AM
    #28
    TuRDLYFE

    TuRDLYFE Well-Known Member

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    My challenge to you (as someone that just bought their first truck) is understand the principle difference between AWD systems and 4WD systems then apply that. There are other factors like full time AWD, shiftable center differentials, limited slip, etc. that change the dynamic of every vehicle for its specific application. Just focus on the principle differences between the two though.
     
    Arti941[QUOTED][OP] likes this.
  9. Feb 1, 2020 at 7:09 AM
    #29
    Dano461

    Dano461 Well-Known Member

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  10. Feb 1, 2020 at 7:12 AM
    #30
    Arti941

    Arti941 [OP] Member

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    Believe me, I understand now. Forum works as it was designed to do. Thanks again
     
  11. Feb 1, 2020 at 7:14 AM
    #31
    Arti941

    Arti941 [OP] Member

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    Just picked up these wheels yesterday. Just had questions on the stance.

    B9638816-6540-4FFC-80FC-1E273078E843.jpg
     
    Stocklocker and Speedfreak like this.
  12. Feb 1, 2020 at 7:18 AM
    #32
    BillsSR5

    BillsSR5 Looking out for #1

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    [​IMG]
     
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  13. Feb 1, 2020 at 7:18 AM
    #33
    Chew

    Chew Not so well known user

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    Looks good, leave it alone!
     
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  14. Feb 1, 2020 at 7:24 AM
    #34
    BillsSR5

    BillsSR5 Looking out for #1

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    to really get that Rake out you'll need to replace the front tires with 35's and then use p245/75/16's size Dunlop AT20's in the rear, a proven method
     
  15. Feb 1, 2020 at 7:27 AM
    #35
    GreyBaldTaco

    GreyBaldTaco Well-Known Member

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    #stancelyfe
    :popcorn:
     
  16. Feb 1, 2020 at 7:29 AM
    #36
    Stocklocker

    Stocklocker Well-Known Member

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    Most are not hydraulic drive. They just run smaller wheels up front by matching the gear ratios in each diff to the wheel size. It’s not complicated as long as you engineer it that way.

    Caterpillar uses shaft drive to planetary gear reduction in both front and back axles. I can’t find an example of a hydraulically driven front, but there’s lots of weird stuff out there I’ve never come across.

    F5857AB0-467E-443D-855D-05E05C4BCFF0.jpg
     
    Last edited: Feb 1, 2020
  17. Feb 1, 2020 at 7:29 AM
    #37
    Ccrames2018

    Ccrames2018 Jack of some trades.

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    -Bilstein+OME suspension, ARB bumper w/Smittybuilt XRC winch, Aero exhaust, CMC, oddball size 275/70R17 General Grabber ATXs on 17x8 0 offset Pro Comp wheels, etc.
    Why not level the front with the rear and add some Firestone Ride-Rite air bags and Daystar cradles to keep it from sagging when you tow with it? Then you can have the look you want and keep your towing capacity.
     
    BillsSR5 likes this.
  18. Feb 1, 2020 at 7:29 AM
    #38
    Clearwater Bill

    Clearwater Bill Never answer an anonymous letter

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    OE wheels?

    255 85 16 all around.

    No lift

    Full 33", no lift, no cut, no rub. Stuffed wheel wells.
     
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  19. Feb 1, 2020 at 7:30 AM
    #39
    dan33410

    dan33410 Well-Known Member

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    Great read, thanks for taking the time to explain. I understood the basics of AWD vs. 4WD, but this is my first truck and first true 4WD I've owned so it's great to know the basics.
     
  20. Feb 1, 2020 at 7:33 AM
    #40
    BillsSR5

    BillsSR5 Looking out for #1

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