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Tire size/gearing question

Discussion in '4th Gen 4Runners (2003-2009)' started by CramblesT4R, Aug 19, 2022.

  1. Aug 19, 2022 at 10:44 AM
    #1
    CramblesT4R

    CramblesT4R [OP] New Member

    Joined:
    Aug 5, 2022
    Member:
    #28083
    Messages:
    8
    Gender:
    Male
    First Name:
    Matt
    Vehicle:
    2003 4Runner Sport
    Bilstein 5100, OME HD Coils FR/R, JBA UCA, 285/70/17 Calvary MT tires on 17x8 Pro Comp Wheels, CBI winch bumper, Coastal Offroad rear bumper with dual swing outs, Dobinsons Snorkel, Rola Roof Rack on 4x Innovation mounts, dual Optima Blue Top batteries, homemade drawer system, big 3 wire upgrade, sequoia alternator and gm diode...probably other random small stuff
    I've got an 03 v8 runner, front and rear bumpers, winch, full size spare, sliders, drawer system...last i checked I'm around 5300#. Currently on 285/70R17 M/T's and possibly going to 305 or 315 in the future. Planning on 4.56 gears this winter, so my question is, will 4.56 gears bee spinning the rpms too high on the highway with the 285's? I run about 1950rpm cruising at 75mph in drive and about 2800 in 4th. Wanting to stay under 3000rpm at 75mph in 5th gear.
     
  2. Aug 19, 2022 at 11:13 AM
    #2
    iamincrediboy

    iamincrediboy New Member

    Joined:
    Dec 16, 2020
    Member:
    #18551
    Messages:
    527
    Gender:
    Male
    South FL
    Vehicle:
    2005 V8 4Runner Limited - Silver
  3. Aug 19, 2022 at 12:40 PM
    #3
    CramblesT4R

    CramblesT4R [OP] New Member

    Joined:
    Aug 5, 2022
    Member:
    #28083
    Messages:
    8
    Gender:
    Male
    First Name:
    Matt
    Vehicle:
    2003 4Runner Sport
    Bilstein 5100, OME HD Coils FR/R, JBA UCA, 285/70/17 Calvary MT tires on 17x8 Pro Comp Wheels, CBI winch bumper, Coastal Offroad rear bumper with dual swing outs, Dobinsons Snorkel, Rola Roof Rack on 4x Innovation mounts, dual Optima Blue Top batteries, homemade drawer system, big 3 wire upgrade, sequoia alternator and gm diode...probably other random small stuff
    I looked at spicers calculator and they show around 2600 rpm with 285's and 4.56 in overdrive. 3.73 and 285's shows around 2k rpm, which is where it sits now at 75.

    Screenshot_20220819-143450_Chrome.jpg
    Screenshot_20220819-143623_Chrome.jpg
     
  4. Sep 15, 2022 at 12:56 PM
    #4
    iamincrediboy

    iamincrediboy New Member

    Joined:
    Dec 16, 2020
    Member:
    #18551
    Messages:
    527
    Gender:
    Male
    South FL
    Vehicle:
    2005 V8 4Runner Limited - Silver
    I mean give Yukon and Nitro gears a phone call. theyll know best since they build these things :cheers:
     

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