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Gearing?

Discussion in 'Performance and Tuning' started by watsonc3, Mar 18, 2016.

  1. Mar 18, 2016 at 7:00 PM
    #1
    watsonc3

    watsonc3 [OP] New Member

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    2014 Tundra 1794 Edition 4x4
    6 in Skyjacker Lift 24x12 Rockstar II's LT315/50R24 Nitto Grapplers Gibson Performance Dual Exhaust Fabfours Veangeance Series Front and Rear Custom bumpers Fabfours side steps Fabfours roof rack with 4 pod face plate Fabfours headache bar 10 Rigid Industries 2x2 lights
    Has anyone lifted their truck, put on bigger tires and changed the gearing in their rear end? Just looking for inputs, recommendations, best place to buy parts/kits.
     
  2. Mar 18, 2016 at 7:23 PM
    #2
    matluth

    matluth Fish On!

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    Aurora CO
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    18"X9" FN BFD's rims, 295/70R/18E Cooper Discoverer STT Pro's, upgraded to Old Man EMU coil-overs/shocks. Toytec shackles Next: true dual exhaust, new UCA's.
    watsonc3 likes this.
  3. Mar 18, 2016 at 7:33 PM
    #3
    matluth

    matluth Fish On!

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    Aurora CO
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    18"X9" FN BFD's rims, 295/70R/18E Cooper Discoverer STT Pro's, upgraded to Old Man EMU coil-overs/shocks. Toytec shackles Next: true dual exhaust, new UCA's.
    You have only two options: Auburn Gear Pro which is a limited slip or ARB air locker which is about twice the cost. I have the Auburn on my must do list. All about my $$money tree. Either option is better than a computer determining what brakes to apply for a fake, wanna be LSD. Your (our) Tundras are not a true 4X4 without one of those options. IMHO. (ie: the options that the "Big Three" provide/offer on their trucks. A huge discrepancy on Toyota. IMHO.)
     
    Last edited: Mar 20, 2016
    ColoradoTJ likes this.
  4. Mar 18, 2016 at 8:03 PM
    #4
    watsonc3

    watsonc3 [OP] New Member

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    2014 Tundra 1794 Edition 4x4
    6 in Skyjacker Lift 24x12 Rockstar II's LT315/50R24 Nitto Grapplers Gibson Performance Dual Exhaust Fabfours Veangeance Series Front and Rear Custom bumpers Fabfours side steps Fabfours roof rack with 4 pod face plate Fabfours headache bar 10 Rigid Industries 2x2 lights
    I looked at the kit from justdifferentials.com. I did the calculations and the nitro 4.88 kit should make my truck run much smoother. When I did the gear calculation it said that I should be running a 4.92 and right now I have a 4.30 so definitely should help. The next time I need tires, if I could find a 36" tire for a 24" rim it would be almost perfect for the 4.88 ratio.
     
  5. Mar 18, 2016 at 8:08 PM
    #5
    csuviper

    csuviper Moderator Staff Member

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    Some Mods :) See build thread for details
    For my Tacoma I went with East Coast Gear Supply complete replacement rear third and front eggshell. 4:56 with 35" tires.
     
  6. Mar 18, 2016 at 8:18 PM
    #6
    matluth

    matluth Fish On!

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    Just Diffs should really be on this site as a vendor. It would eliminate a lot of Diff questions. They gave me a fair price, and most important, they back up what they say. You give them a call, explain what you want, you will get real answers. They are gear people. Nothing else.
     
    watsonc3 likes this.
  7. Mar 19, 2016 at 3:25 AM
    #7
    bigsapz

    bigsapz New Member

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    If you have the tow package with 4.30s, that's more than enough to run 35s. You definitely do not need 4.88s unless you're running 38-40s.
     
    matluth likes this.
  8. Mar 19, 2016 at 10:19 AM
    #8
    watsonc3

    watsonc3 [OP] New Member

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    2014 Tundra 1794 Edition 4x4
    6 in Skyjacker Lift 24x12 Rockstar II's LT315/50R24 Nitto Grapplers Gibson Performance Dual Exhaust Fabfours Veangeance Series Front and Rear Custom bumpers Fabfours side steps Fabfours roof rack with 4 pod face plate Fabfours headache bar 10 Rigid Industries 2x2 lights
    When you do the math, with the tires I have now(converting to standard measurement equals a 36.5") the perfect gearing for the truck would be 4.92 to make it run the same as with stock tires and the 4.30 gearing. The nitro 4.88 kit is the closest thing I could find and with that should keep the truck in better rpm ranges. My truck only has 14k miles on it. If I change the gearing now to make it easier on the motor and tranny, seems like a smart decision to me.
     
    ColoradoTJ likes this.
  9. Mar 19, 2016 at 8:04 PM
    #9
    bigsapz

    bigsapz New Member

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    I stand corrected.
     
  10. Mar 20, 2016 at 2:20 PM
    #10
    tat2ude39

    tat2ude39 MYota

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    When I added my 295's I inquired on the gearing ratio also and SDHQ said up to 35" tires the 4.30 was fine. They didn't recommend changing to the 4.88 unless you were going to 37's or larger.
     
  11. Mar 20, 2016 at 5:12 PM
    #11
    matluth

    matluth Fish On!

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    18"X9" FN BFD's rims, 295/70R/18E Cooper Discoverer STT Pro's, upgraded to Old Man EMU coil-overs/shocks. Toytec shackles Next: true dual exhaust, new UCA's.
    It all depends on your driving habits and to not worry about wasting $$ on widgets that might save a couple of tenths MPG.
     
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