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Thread: 1990 Suburban tire size

  1. #1
    Join Date
    Mar 2001
    Location
    Concord CA
    Posts
    36

    Default 1990 Suburban tire size

    It is time for new tires and I am wondering if 31x10.5x15 are to tall for this 2wd suburban. It it has a 3.08 ratio rearend and a 700R transmisssion. Does the 6.2 have enough power for me to use these tires? They would look better then stock.

  2. #2
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,573

    Arrow

    That tire size was an OEM option for most 1/2 ton 4x4's, even with 3.08 original gears (reg. cab, SB 1500 PU). The Sub may be a bit heavy. The 700R4 transmission is an advantage with those tall gears, as 1st gear is very deep. You may find though, OD may only be practical at 60 MPH+. 3.08 is pretty tall with fat 31's w/o a turbo.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  3. #3
    Join Date
    Sep 2006
    Posts
    363

    Default

    Quote Originally Posted by nlines View Post
    It is time for new tires and I am wondering if 31x10.5x15 are to tall for this 2wd suburban. It it has a 3.08 ratio rearend and a 700R transmisssion. Does the 6.2 have enough power for me to use these tires? They would look better then stock.
    I have tried 31x10.5 with a setup like yours and yes, it's too tall of a tire. For good driveability and fuel economy, stick with either 235/75/15 or 30x9.50x15.
    1990 ¾ ton 4x4 Chevy Suburban
    -Cummins Diesel - 12 valve - factory rebuilt
    -6 speed bullet proof manual transmission - NV5600
    -Gear Vendors Overdrive
    -Upgraded Holset HX-35 turbo
    -NP205 iron transfer case
    -3.73 gears

    1982 ½ ton Chevy Suburban
    -6.2L diesel - high nickle crack free 1982 block
    -Stans headers
    -Ported heads
    -Timing gear
    -4 speed automatic
    -3.08 gears
    -30 mpg on freeway

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