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Just installed 4.88 gears and lockers and 33's but highway driving sucks

Discussion in '2nd Gen. Tacomas (2005-2015)' started by coganhagen01, Jul 18, 2021.

  1. Jul 18, 2021 at 10:55 AM
    #1
    coganhagen01

    coganhagen01 [OP] Well-Known Member

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    Lift, working on gears and lockers, and finding parts im missing!
    Wondering what the cheapest and easiest way to get lower rpms on highway. Now at 70 mph I'm running around 3100 rpm. Seems like it needs a 7 th gear in Trans. Would going bigger tires help. I think I should have went with 4.56 gears.
     
  2. Jul 18, 2021 at 11:15 AM
    #2
    Disco_Inferno_

    Disco_Inferno_ Active Member

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  3. Jul 18, 2021 at 11:18 AM
    #3
    coganhagen01

    coganhagen01 [OP] Well-Known Member

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    What would u suggest
     
  4. Jul 18, 2021 at 11:22 AM
    #4
    Disco_Inferno_

    Disco_Inferno_ Active Member

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    If you are going to do a lot of highway driving, 4.56 would help. Or just accept driving slower in the right lane.

    If you are doing some hardcore wheeling, the 4.88s might be worth the trade off.

    What does a normal month of driving look like for you? (% city driving, highway, off-road)
     
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  5. Jul 18, 2021 at 11:24 AM
    #5
    coganhagen01

    coganhagen01 [OP] Well-Known Member

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    More city and off road then highway
     
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  6. Jul 18, 2021 at 11:30 AM
    #6
    01 dhrracer

    01 dhrracer Well-Known Member

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    What vehicle? Is it shifting into high gear? Is it the 07 shown in your profile? Auto or manual. Per the Motor Trend articles formula your RPM should be about 2500 in 5th gear for a Auto trans. 5th gear is .716-1. (70mph x 4.88 x 336 divided by 33= 3478.1090909091 x .716 (5th gear)= 2490.326109 rpm
     
    Last edited: Jul 18, 2021
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  7. Jul 18, 2021 at 11:31 AM
    #7
    IvanhoeTaco

    IvanhoeTaco Well-Known Member

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    You need bigger tires.
     
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  8. Jul 18, 2021 at 11:34 AM
    #8
    jmd025

    jmd025 Well-Known Member

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    Just gonna throw this out there ... how exactly are your measuring the 70mph ? Is it accurate

    the reason I ask is that 3100@70 can’t be achieved in either 4th or 5th/overdrive with true 4.88s and true 33s
     
    Last edited: Jul 18, 2021
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  9. Jul 18, 2021 at 11:55 AM
    #9
    Kolter45

    Kolter45 Well-Known Member

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  10. Jul 18, 2021 at 12:01 PM
    #10
    coganhagen01

    coganhagen01 [OP] Well-Known Member

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    It's an 07 tacoma 6 speed manual
     
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  11. Jul 18, 2021 at 12:07 PM
    #11
    coganhagen01

    coganhagen01 [OP] Well-Known Member

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    Lift, working on gears and lockers, and finding parts im missing!
    I have hypertech speedo calb and checked on GPS it's 70 miles. At 70 in 6th gear it's just at 3000rpm then at 75 mph it's 3200rpm. It's 4.88 gears from east coast gear and it's 285/70/17
     
  12. Jul 18, 2021 at 12:10 PM
    #12
    coganhagen01

    coganhagen01 [OP] Well-Known Member

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    Lift, working on gears and lockers, and finding parts im missing!
    I was thinking bigger tires because in that aspect they ask when u buy gears which tire size do u plan on running
     
  13. Jul 18, 2021 at 12:14 PM
    #13
    parel

    parel Well-Known Member

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    Last edited: Jul 18, 2021
  14. Jul 18, 2021 at 12:24 PM
    #14
    IvanhoeTaco

    IvanhoeTaco Well-Known Member

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    In the grand scheme of things that rpm is safe and as long as engine is in good working order you will have zero problems. 300rpms lower isnt going to make any difference other than maybe peace of mind.
     
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  15. Jul 18, 2021 at 12:29 PM
    #15
    parel

    parel Well-Known Member

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    -5Db?
     
  16. Jul 18, 2021 at 12:31 PM
    #16
    IvanhoeTaco

    IvanhoeTaco Well-Known Member

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    Exactly.
     
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  17. Jul 18, 2021 at 12:42 PM
    #17
    coganhagen01

    coganhagen01 [OP] Well-Known Member

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    Lift, working on gears and lockers, and finding parts im missing!
    I already bought my fj cruiser transfer case for my twin stick swap, it's next on project list. Can I put taller gears in my Trans when I pull it out to replace clutch. I really don't want to get 3rd gen Trans just more work and money to fit. Would bigger tires fix this issue? I just bought them last week
     
    Last edited: Jul 18, 2021
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  18. Jul 18, 2021 at 12:49 PM
    #18
    Matmo215

    Matmo215 Well-Known Member

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    Yeah you overgeared for 33’s
     
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  19. Jul 18, 2021 at 12:54 PM
    #19
    parel

    parel Well-Known Member

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    Putting new gears in would be an extremely custom thing. Definitely not an off the shelf solution. The gen 3 Tranny also has a stainless quill…
     
  20. Jul 18, 2021 at 1:00 PM
    #20
    Kolter45

    Kolter45 Well-Known Member

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    Add some armor too. Remember you’re just preparing for Moab in the future :amen:
     
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