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Gear down for 31 inch tires?

Discussion in 'Wheels & Tires' started by pherpher1985, Sep 21, 2008.

  1. Sep 21, 2008 at 6:59 AM
    #1
    pherpher1985

    pherpher1985 [OP] Member

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    I have a 1998 tacoma extracab 2.7 4x4 with 31x10.50's. I was just wondering, since stock tire size was 225/75/15, has anyone tried gearing down when they went to 31's? I know that the larger size reduces RPM's and is a little extra weight to sling around and I was just wondering if I should try to do a gear swap. Thanks
     
  2. Sep 21, 2008 at 7:04 AM
    #2
    luk8272

    luk8272 Poodoo

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    Were those 225/75/15 factory? That calculates to a 28" tall tire. My 90 toyota pickup came factory with 30.6" tall tires. Either way unless you do some serious offroading you will be fine with your factory gear. Assuming it is a 3.73 or shorter.
     
  3. Sep 21, 2008 at 7:18 AM
    #3
    pherpher1985

    pherpher1985 [OP] Member

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    Ok I looked at my factory sticker and it tells me that I have an 8" 2 pinion open rear end with 3.58 gearing. Sounds a bit high to me. The sticker also says that the stock tire was indeed 225/75/15.
     
  4. Sep 21, 2008 at 7:24 AM
    #4
    luk8272

    luk8272 Poodoo

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    Well then if you really offroad alot, I doubt that you do seeing as how you have an open diff, and need the gear yes definately get new gears. Your setup now will translate to a 3.25 gearing. I'm surprised to see such a short tire on a 4x4. Being a 4x it makes gear swaping expensive. If you decide to go that route a 3.90 gear or the negibhorhood of will put you back close to factory. However if you are changing your gears and want a little more installing 4.10 gears will make your truck handle like it has 3.70.
     
  5. Sep 21, 2008 at 7:29 AM
    #5
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    4.10 gears, sliders, and lots of buttons.
    If you are going to re-gear, get 4.10's. That way, when you get new tires, you could even go with a 32" tall tire if you decided. I had 4.30's on my 2000 4x4 5 speed, and it was great! :)
     
  6. Sep 21, 2008 at 7:30 AM
    #6
    pherpher1985

    pherpher1985 [OP] Member

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    I mainly do highway driving and a lot of around town. I've just noticed that I lack power in 5th gear. If i get into 5th below 60 mph the truck shakes as if it is underpowered in that gear. Just trying to figure out if I've got the optimal gears.
     
  7. Sep 21, 2008 at 7:37 AM
    #7
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    With 31" tires, My truck was turning 2300 rpm @ 60 mph. If its has "shakes" at 60 in 5th gear, you may have another issue.
     
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