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anyone with 4.88 or 5.13 ratios

Discussion in 'Wrangler JK (2007-2017)' started by jeepavalanche, Aug 10, 2020.

  1. Aug 10, 2020 at 4:54 PM
    #1
    jeepavalanche

    jeepavalanche [OP] Well-Known Member

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    I've been on record as saying how much I like the 3.21 gear ratio. It gets my Jeep off and going with the tire carrier, front/rear bumper, and 37in tires.

    Having said that, I'd still like to have a little more off the line, but can't decide if 4.88 or 5.13 is the way to go, so if any of you have one of those gear ratios, please chime in. Thanks!!!
     
  2. Aug 10, 2020 at 6:45 PM
    #2
    Jim Beam

    Jim Beam Well-Known Member

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    Fuel Injection, Dana 44s, T18, 4.10s w/lockers
    A 37" tire is quite heavy and it takes a lot of torque to get them going. It is also hard on the clutch or auto trans temp. A V8 engine would really help.
     
    jeepavalanche [OP] and LYFZGOOD like this.
  3. Aug 10, 2020 at 8:51 PM
    #3
    aggrex

    aggrex Well-Known Member

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    Tuffy>AEV>TTO>JW>STech>EVOcage>MagnaFlow>SpiderTrax>RockHard>TF>SpringTail>67design>Bolt>GPCA>Curt>
    Check out the attached chart. This chart should be a good guide. There may be other similar charts.IMG_3972.jpg
     
    jeepavalanche [OP] likes this.
  4. Aug 10, 2020 at 9:04 PM
    #4
    jeepavalanche

    jeepavalanche [OP] Well-Known Member

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    Good chart. I see it takes in account for tire size, I wonder if armour (bumpers, tire carriers) are factored in. Based on that it looks like 4.56 or 4.88 would be my best bet.
     
  5. Aug 11, 2020 at 10:01 AM
    #5
    Blue Baby Sound

    Blue Baby Sound Well-Known Member

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    All the world's indeed a stage And we are merely players Performers and portrayers Each another's audience Outside the gilded cage
    Build threads in sig
    Depends on which motor you have, trans you have and whether you have 2 or 4 doors.
    • 4.88 is perfect on our 2 door with 37s, wouldn't change a thing.
    • 4.88 isn't quite enough on our 4 door when on 37s, wish I'd gone 5.13.
    Both are the 3.6 motor and Auto.

    Good luck!
     
    jeepavalanche [OP] and aggrex like this.
  6. Aug 11, 2020 at 1:05 PM
    #6
    jeepavalanche

    jeepavalanche [OP] Well-Known Member

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    I have a 3.6 with auto trans. It is fully armoured with 37inch tires. Do you get decent rpm's on the 4.88 when you are highway driving? Just don't want to go 60 at 3,000 RPM's, and that's what Im afraid of with 5.13. Thanks!!!
     
  7. Aug 11, 2020 at 1:12 PM
    #7
    Blue Baby Sound

    Blue Baby Sound Well-Known Member

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    All the world's indeed a stage And we are merely players Performers and portrayers Each another's audience Outside the gilded cage
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    Look at the chart above, but remember most 37s are really only about 35 3/4 true height when mounted.
    You'll be under 3k at 60 mph and you'll be less likely to downshift thus saving RPMs in some scenarios.
    I thought/fought long and hard about 4.88 or 5.13, just sharing with you that in hindsight I wish I'd gone 5.13 on the 4 door.
     
    aggrex and jeepavalanche [OP] like this.
  8. Aug 11, 2020 at 1:19 PM
    #8
    jeepavalanche

    jeepavalanche [OP] Well-Known Member

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    Well, if you wish you'd had gone with the 5.13 then I'd probably feel the same way. I'll look and see where I can find 5.13's for the stock Danas.
     
    Blue Baby Sound likes this.

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