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tire size help

Discussion in '1st Gen. Tacomas (1995-2004)' started by toyotadan, May 2, 2010.

  1. May 2, 2010 at 8:16 PM
    #1
    toyotadan

    toyotadan [OP] Member

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    washington
    Vehicle:
    98 4x4
    Just got a 98 4x4 excab 4 cyl with 235 15's,I want to put 31's on it but not sure if truck will be able to handle them as it seems to be tall geared, any info will help. Thx Dan P.S will they kill my gas mileage or am i worrying about nothing?
     
  2. May 2, 2010 at 8:19 PM
    #2
    91Toyotabogger

    91Toyotabogger "Loud Tires Can Save Lives"

    Joined:
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    North Carolina
    Vehicle:
    91 4wd 5sp manual Pickup Standard cab white
    Mud Tires, CD player, CB radio with PA speaker, De-badged, window decals, Flow Master 40 series
    31's on my truck made no difference but i have a v6, still get like over 20mpg
     
  3. May 2, 2010 at 8:32 PM
    #3
    steve o 77

    steve o 77 braaap

    Joined:
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    In a corn field, OH
    Vehicle:
    1990 Chevy Siveraydo
    245k+ miles, rust, working AC, bald eagles
    Look in your door jam for the gear code. It will be something like B03A

    Compare to this chart.
    First digit:

    A = 7.5" ring gear
    B = 8" ring gear
    Next two digits:

    01 = 3:42
    02 = 3:58
    03 = 4:10
    04 = 4:56
    05 = 3:15
    06 = 3:91
    07 = 4.30
    Last digit:

    A = 2 Pinion, Open
    B = 4 Pinion, Open
    C = 2 Pinion OEM Limited Slip
    some '98-00 models have shown a BO code of "???" on the door plate; so far this turns out to be a 3.91 gear ratio, at least for the 5sp. RZN171L-CRPDKAB with factory 31s/265s should be 4.56 with the AT

    If you have 4.10's then the tires will be absolutely fine, but if not you will notice a drop in power and MPG
     
  4. May 3, 2010 at 8:56 PM
    #4
    toyotadan

    toyotadan [OP] Member

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    washington
    Vehicle:
    98 4x4
    thanks for the replys my code is B03A,which indicates 410's?if so truck is tall geared with m/t .still not sure about 31's 225/75r15 are the stock size 4 truck.
     
  5. May 3, 2010 at 8:57 PM
    #5
    steve o 77

    steve o 77 braaap

    Joined:
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    In a corn field, OH
    Vehicle:
    1990 Chevy Siveraydo
    245k+ miles, rust, working AC, bald eagles
    with 4.10's, you will pull the 31's just fine.
     
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