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3.73's to 4.88's = trouble!!!!

Discussion in '2nd Gen. Tacomas (2005-2015)' started by ninjadino, Dec 22, 2010.

  1. Dec 22, 2010 at 9:04 AM
    #1
    ninjadino

    ninjadino [OP] New Member

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    clayton
    thunder bay, ontario, canada
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    lifted 06 tacoma
    6" procomp suspention lift, 35" toyo mt's, 17" moto metal rims, 4.88 gears, flowmaster catback exhaust, k&n cold air intake, jba headers
    I'm driving a 2006 toyota tacoma with a 6 inch procomp suspention lift with 35's. I have a flowmaster catback exhaust system, jba headers and a CAI... All these mods work well and have had no trouble with them. The issue im having is my gearing... im running 4.88's from a stock 3.73. I have been through 2 sets of gears in the last year. The first set was due to abuse offroading but the second is a little fishy... I think the diff is too small to be running this setup. My tranny is manuall wich definately doesnt help. Im considering swaping the rear axle. Would a Tundra axle fit? Has anyone experienced anything like this? Its easy to find an axle to fit but i want to keep the abs and all the other electronic devices. Any suggestions anyone?
     
  2. Dec 22, 2010 at 9:20 AM
    #2
    Chachie

    Chachie Well-Known Member

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    Justin
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    Locker mod, Anytime fog mod, always 400w mod.
    There is an underlying problem there. There are people here funnung 4.88's with no problems at all. Did you do the install?
     
  3. Dec 22, 2010 at 9:22 AM
    #3
    Dark Knight

    Dark Knight Well-Known Member

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    the problem is not the gears, it is your mechanic not setting them up correctly.
     
  4. Dec 22, 2010 at 9:24 AM
    #4
    Chachie

    Chachie Well-Known Member

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    Locker mod, Anytime fog mod, always 400w mod.
    ^x2. Thats what i was thinking something is not set right. If the ratio was too big for the diff they wouldnt sell it.
     
  5. Dec 22, 2010 at 9:56 AM
    #5
    builthatch

    builthatch MiG-21 superfan

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    Tony Mandarich
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    off-topic, but how can someone quality the acceleration difference when going from 3.73 to 4.88 on pavement! i understand the reasoning from an off-road perspective but i'm curious about how much faster it makes the truck ON road. man, when cruising on the highway the revs have to be so much higher, no?
     
  6. Dec 22, 2010 at 9:58 AM
    #6
    Chachie

    Chachie Well-Known Member

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    Locker mod, Anytime fog mod, always 400w mod.

    I cant tell you how much "faster", but i can tell you the truck will actually be slower. It will accelerate much better, but your revs on the highway will be a little higher.
     
  7. Dec 22, 2010 at 9:58 AM
    #7
    bjmoose

    bjmoose Bullwinkle J. Moose

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    How do they fail?
     
  8. Dec 22, 2010 at 10:05 AM
    #8
    Smellfunny

    Smellfunny Member

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    Probably need to go to a shop that rebuilds transmissions and rears and have them set it up for you.

    The 4.88 gear is gonna give you ummph at take off but kill your top end. There are several sites http://www.rocky-road.com/calculator.html that you can enter tire size and ratios and get your speed differences. I would think your truck is gonna say 95 or so and you will be going 60 mph range with those tires and that ratio.
     
  9. Dec 22, 2010 at 10:09 AM
    #9
    Chachie

    Chachie Well-Known Member

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    Locker mod, Anytime fog mod, always 400w mod.

    Actually the truck speedo will be just about right on. Because with the bigger tires, your speedo is going to show low, then you correct it with gearing. And the difference would not be that great. I am running 35's on stock gearing right now and i am only doing 5mph over what the speedo says.
     
  10. Dec 22, 2010 at 10:09 AM
    #10
    WhatThePho?

    WhatThePho? Greg Graffin 2016

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    Pretty cool link
     
  11. Dec 22, 2010 at 11:26 AM
    #11
    Coupe

    Coupe Well-Known Member

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    Lots baby!
    I am on the other end of the spectrum. I have a S/C X-Runner. I went from 3:15 to 4:10 and I have a T56 magnum 6 speed trans. Acceleration is great. The T56 Magnum has 0.74 for 5th and 0.50 for 6th (this is the Ford ratios). At 85 mph I am looking at 2100~2200 rpm, in 6th.
     
  12. Dec 22, 2010 at 11:30 AM
    #12
    fireturk41

    fireturk41 I like to break shit!

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    i think it is your mechanic setting the gears incorrectly, talk with chase at eastcoastgearsupply.com or call them, they know their shit and have an awesome warranty, theyll even assemble it and ship to you
     
  13. Dec 22, 2010 at 1:57 PM
    #13
    timstaco47

    timstaco47 Member

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    I have a 2010 automatic with 35's.A local 4x4 shop said the only gears I could use are 4.88. I was thinking 4.56 would bring it closer to stock? can I use 4.56 gears?:infantry::infantry:
     
  14. Dec 22, 2010 at 2:15 PM
    #14
    Incognito

    Incognito μολὼν λαβέ

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    You sure can use 4.56's.
     
  15. Dec 22, 2010 at 2:20 PM
    #15
    07trd4x4

    07trd4x4 Well-Known Member

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    Did you go to 4wheel parts!?!? If so that is your problem!

    Sorry about it dude hope it gets worked out
     
  16. Dec 22, 2010 at 2:27 PM
    #16
    Slimwood Shady

    Slimwood Shady I love your mom!

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  17. Dec 22, 2010 at 3:59 PM
    #17
    bjmoose

    bjmoose Bullwinkle J. Moose

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    He's in Ontario Canda, probably 500 miles from the nearest 4WP.
     
  18. Dec 22, 2010 at 4:00 PM
    #18
    bjmoose

    bjmoose Bullwinkle J. Moose

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    Folks jumping at conclusions in a big way here. Definitely need more info from the OP about how the failure occurred.
     
  19. Dec 22, 2010 at 4:33 PM
    #19
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    4.10 gears, sliders, and lots of buttons.
    Bingo.
     
  20. Dec 22, 2010 at 4:38 PM
    #20
    MonkeyProof

    MonkeyProof Power Top

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    nothing new with gears breaking in our tacos..i know a few who have broken stock gears under mild off roading conditions..

    and i just recently broke a 4.56 set driving around the neighborhood :rolleyes:, but i do agree...our rear ends are too small
     
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