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Transmission

Discussion in 'Wrangler JK (2007-2017)' started by Codyfolsom, Jul 22, 2018.

  1. Jul 22, 2018 at 11:28 AM
    #1
    Codyfolsom

    #1
    Codyfolsom [OP] New Member

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    I have a 2011 jeep wrangler sport and I bought it with bigger tires than stock and didn't up the trans or gears on the front or rear axles. What's the next size up transmission and gears for a rearend and frontend? Assuming everything is factory stock right now
     
    Codyfolsom, Jul 22, 2018
    #1
  2. Jul 22, 2018 at 11:38 AM
    #2
    chris4x4

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    chris4x4 With sufficient thrust, pigs fly just fine Moderator

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    Welcome! What size tires are on it, and what gears does it currently have?
     
    chris4x4, Jul 22, 2018
    #2
  3. Jul 22, 2018 at 12:35 PM
    #3
    Codyfolsom

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    Codyfolsom [OP] New Member

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    35-12.5-17 I'm assuming stock
     
    Codyfolsom, Jul 22, 2018
    #3
  4. Jul 22, 2018 at 12:35 PM
    #4
    Codyfolsom

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    Codyfolsom [OP] New Member

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    I have no idea what it came with from the factory
     
    Codyfolsom, Jul 22, 2018
    #4
  5. Jul 22, 2018 at 2:11 PM
    #5
    aggrex

    #5
    aggrex Well-Known Member

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    Tuffy>AEV>TTO>JW>STech>EVOcage>MagnaFlow>SpiderTrax>RockHard>TF>SpringTail>67design>Bolt>GPCA>Curt>
    Welcome! The 2011 JK running 35s could be challenging depending on how its expected to perform off road or on the road as the engine specs or seat-of-the-pants will reveal. Check out the chart for reference as many 3.8L owners have the same issue as you with 35s.

    3.8-liter V6
    202 horsepower @ 5200 rpm
    237 lb.-ft. of torque @ 4000 rpm
    EPA city/highway fuel economy: 15/19 (4WD, manual), 15/19 (4WD, automatic)

    Cap333ture.jpg
     
    aggrex, Jul 22, 2018
    #5
    Billy1234 and JKBob 25 like this.
  6. Jul 23, 2018 at 11:19 AM
    #6
    Billy1234

    #6
    Billy1234 Well-Known Member

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    Explain this chart a little aggrex. I’m assuming that it’s the best gear ratio for the tire size?
     
    Billy1234, Jul 23, 2018
    #6
  7. Jul 23, 2018 at 12:40 PM
    #7
    aggrex

    #7
    aggrex Well-Known Member

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    Tuffy>AEV>TTO>JW>STech>EVOcage>MagnaFlow>SpiderTrax>RockHard>TF>SpringTail>67design>Bolt>GPCA>Curt>
    Its just a reference chart for the 3.8L (AT/MT) that shows the effect on rpms @ 70 mph when comparing larger than stock tires. Running larger than stock tires can result in sluggish performance and reduced effectiveness of 6th gear for example at highway speeds. Generally after selecting the larger tire size to run the recommendation is to REGEAR towards upper yellows to greens for stock or better performance. Your overall usage of the JK as a DD or trail rig will guide you in the right direction.
     
    aggrex, Jul 23, 2018
    #7
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