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2.7l is weak, should I regear???

Discussion in '4 Cylinder' started by 00PreRunner, Apr 25, 2012.

  1. Apr 25, 2012 at 5:56 AM
    #1
    00PreRunner

    00PreRunner [OP] Well-Known Member

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    I have a 2000 Prerunner with the 2.7l and auto tranny. The truck is very weak off idle and gets bad gas mileage around town. A friend has a set of 4.30's I can use to swap out my 3.91's. My question is how high will my rpms be going down the interstate and how off will my speedo be? Thanks
     
  2. Apr 25, 2012 at 6:30 AM
    #2
    Devux

    Devux The Polar Bear

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    I can't quantify anything for you but in general going from a 3.91 to a 4.30 your performance (acceleration distance) will increase, your fuel mileage is going to drop, and your highway RPMs are going to be higher.
    If you're looking for a performance increase it might be worth looking into a good exhaust system, intake, hot ignition and high performance plugs and plug wires. My dad did a mild tune to his '98 Rodeo (4 Cylinder), it gave it a bit more oomph, he's happy with it. Better than messing with the rear gear in my opinion.
     
  3. Apr 25, 2012 at 6:32 AM
    #3
    00PreRunner

    00PreRunner [OP] Well-Known Member

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    Thanks for the advice. I'd much rather look into exhaust and intakes then gears.
     
  4. Apr 25, 2012 at 5:44 PM
    #4
    afd23a

    afd23a Well-Known Member

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  5. Apr 25, 2012 at 6:01 PM
    #5
    worthywads

    worthywads Well-Known Member

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    The math is really simple.

    Current rpm times 4.30/3.91 or 1.1


    If you are 2500 at 60 now you will be 2500 * 1.1 = 2750.
     
  6. Apr 26, 2012 at 5:58 AM
    #6
    00PreRunner

    00PreRunner [OP] Well-Known Member

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    Nothing yet. Just getting started.
    Thanks for the help. I'm adding cruise control here in a few days. I'll see if that makes a difference.
     
  7. Apr 26, 2012 at 7:08 PM
    #7
    tan4x4

    tan4x4 Well-Known Member

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    I have a 2.7 with automatic, and it has 4.56 gears from the factory.
    Are you sure you have 3.91's? What is your axle code on the door jamb?
     
  8. Apr 26, 2012 at 7:14 PM
    #8
    08pretaco

    08pretaco Almost there

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    have you done a head to toe tune-up on the motor/vehicle?
     
  9. Apr 30, 2012 at 5:49 AM
    #9
    00PreRunner

    00PreRunner [OP] Well-Known Member

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    The code on the door is B06A. From what I can tell, that means it has an 8" diff, 3.91's, and an open rear end. And no I haven't tuned it.
     
  10. May 1, 2012 at 10:40 AM
    #10
    ronman737

    ronman737 Dangerous

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    Bilstein HDs, K&N Drop in, fresh chassis, camper, 235/85s
    New spark plugs(platinum or iridium), Afe pro dry or K&N air filter. I bet you will feel a difference. Also, do the seafoam mod. 1/3 bottle in the gas tank,1/3 in the oil (pre oil change, ride on it for about 1000 miles to let it do some work) 1/3 bottle in the intake manifold. Ill try to find the thread on it for you.
     
  11. May 1, 2012 at 10:43 AM
    #11
    BuzzardsGottaEat

    BuzzardsGottaEat "Pick up some speed.. You'll make it."

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    I second the tune up. And if that's not sufficient the intake/exhaust options. . .
     
  12. May 1, 2012 at 11:10 AM
    #12
    Trifenix

    Trifenix Well-Known Member

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    Usually only regear if you are running larger tires. Do a tune up.seafoam. aftermarket air filter. Your truck is just slow. Buy a v6 or v8.
     
  13. May 1, 2012 at 12:11 PM
    #13
    ronman737

    ronman737 Dangerous

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  14. May 2, 2012 at 5:45 AM
    #14
    00PreRunner

    00PreRunner [OP] Well-Known Member

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    Nothing yet. Just getting started.
    Thanks for the seafoam link
     
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