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changing from 3.727 gear ratio to 4.56

Discussion in 'Technical Chat' started by tacowithbeans, Apr 17, 2012.

  1. Apr 17, 2012 at 9:57 AM
    #1
    tacowithbeans

    tacowithbeans [OP] Member

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    i currently have a rear differential with a 3.727 gear ratio and im running 33 inch mud grapplers. what would change if i regeared to a 4.56 gear ratio and kept my 33 inch tires?
     
  2. Apr 18, 2012 at 6:56 AM
    #2
    tacowithbeans

    tacowithbeans [OP] Member

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    someone? anyone help me out here i need to know what it will do to my gas mileage my speedometer my power everything
     
  3. Apr 18, 2012 at 7:43 AM
    #3
    tacowithbeans

    tacowithbeans [OP] Member

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    well my MPGs were bad i guess because of the tires but how much of a dive do you think it would take on the highway? i figured it would kind of even it out with the new ratio and make it closer to stock MPGs am i wrong or right?
     
  4. Apr 18, 2012 at 7:44 AM
    #4
    tacowithbeans

    tacowithbeans [OP] Member

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    i appreciate any help i can get this thing has been a headache and the gear change seems to be the only other alternative
     
  5. Apr 18, 2012 at 7:49 AM
    #5
    Delmarva

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    You can expect to see 24-2500 RPM while at 65-70mph.. This results in shitty mpgs
     
  6. Apr 18, 2012 at 9:51 AM
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    tacowithbeans

    tacowithbeans [OP] Member

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    i already run my rpms that high with the 3.727 i was just hoping it would balance out since i never changed anything but the tire size. any help on how to get better MPGs?
     
  7. Apr 18, 2012 at 9:53 AM
    #7
    tacowithbeans

    tacowithbeans [OP] Member

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    i swear i must have the only taco like this its weird nobody but dealer has parts for my taco and they want to screw me with no loving
     
  8. Apr 18, 2012 at 9:56 AM
    #8
    Krazie Sj

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    There is something very wrong if your truck is that high in the RPM range with those tires on stock gears. Mine is at 2100 RPMs at 70mph.

    If anything you should go to 4.10 gears. Those will bring you closest to stock range/power with 33's.
     
  9. Apr 18, 2012 at 10:18 AM
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    Delmarva

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    This
     
  10. Apr 18, 2012 at 12:53 PM
    #10
    tacowithbeans

    tacowithbeans [OP] Member

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    same thing i said but ive searched everywhere and cant find that gear ratio for my truck or that will fit in my housing, the stock gears will cost me more than the 4.56 gears because they are an oem part or so i was told and when i asked about the 4.10 gears they said they didnt offer that option i dont get it i just dont. ill see what happens if nothing else ill trade my gas hog for a new generation taco :)
     
  11. Apr 18, 2012 at 12:58 PM
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    Krazie Sj

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    4.11 are available to buy anywhere. 4.10 are as you said, OEM gears by Toyota. A junk yard 4 banger will have them. You're lucky that you're a Prerunner as you only need one diff worth of them.
     
  12. Apr 18, 2012 at 1:23 PM
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    Krazie Sj

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  13. Apr 22, 2012 at 6:31 PM
    #13
    jwmaynard

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    This site has really poor info on re-gearing that keeps being re-stated over and over again. The reason mileage suffers when you do not lower your gears after a tire size increase is that (in addition to the new rotating mass/weight) your engine is laboring and not operating at it's peak torque curve as it was designed to do. 4.56 gears will not make your make your mpg's dive as stated above and are almost as ideal as the 4.11's depending on the size of the 33"s some are closer to 32" and some are closer to 34", depending on wheel size, and manufacturer. The trick here if you are concerned about mpg is to find out at what RPM the peak of your toqure curve is when you are driving at highway speeds/gear and operate the vehicle at that speed. You could very well get better mileage with 4.56's. I doubt that most of the people here have ran a Taco of your year with both 4.11's and 4.56 at the exact same tire height as yours and with your driving habits. Sorry if it sounds like I'm flaming anyone here (not my intention) but do a quick search and it's the same nonsense being repeated over and over by people with no knowledge of gear setups.
     
  14. Apr 22, 2012 at 6:35 PM
    #14
    jwmaynard

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    Is your truck shifting into overdrive? Sometimes larger tires will have this effect/affect (I never get that right)
     
    Telkins88 likes this.
  15. Apr 22, 2012 at 6:49 PM
    #15
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    4.10 gears, sliders, and lots of buttons.
    Not always. With a lift, and large tires, not only adding more rotational mass (tires), you are increasing the frontal area of the truck. Going up in gears to a 4.10, or 4.56 , in some cases, return lost hwy mpg, as the engine is doing less work to move the vehicle at the same speeds.
     
  16. Apr 22, 2012 at 6:53 PM
    #16
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Moderator

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    4.10 gears, sliders, and lots of buttons.
    Gotcha.
     
  17. Apr 22, 2012 at 7:05 PM
    #17
    jandrews

    jandrews Carolina Alliance Southwest Region Ambassador

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    Gearing will also help town MPG, so depending on what the OP drives most, he could come out ahead.
     
  18. Apr 22, 2012 at 7:26 PM
    #18
    worthywads

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    Assuming these 33s are actually 33 and not 29s??? with 4.10 gears the rpm would be up 3%, and with 4.56 gears the rpm will be up 14% from stock.
     
  19. Apr 23, 2012 at 9:44 AM
    #19
    tacowithbeans

    tacowithbeans [OP] Member

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    i really appreciate all the help as for the overdrive question im not sure i try to baby my truck when possible but sometimes i have to put my foot down and it does go into overdrive and i probably use a few gallons of liquid gold by doing so
     
  20. Apr 23, 2012 at 10:01 AM
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    jwmaynard

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    29's ? Just re-read my post (sorry it was late) I should have said 32"-34"
     
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