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2002 Rear Ring Gear Size

Discussion in '3rd Gen 4Runners (1996-2002)' started by sntandrew, Jul 11, 2015.

  1. Jul 11, 2015 at 5:49 PM
    #1
    sntandrew

    sntandrew [OP] New Member

    Joined:
    Jul 11, 2015
    Member:
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    5
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    Male
    South Carolina
    Vehicle:
    2002 Black 4Runner 4x4 SR5
    3" Rough Country Suspension Lift Rola Roof Rack 31.5 BFG AT KOs 2 Goal Zero Solar Panels
    I have a 2002 4Runner 4x4 SR5 I have a bad outer pinion bearing. However there are 2 choices 1 for a 6.7 inch ring, and 1 for a 8.8 inch ring. The only number I found are stamped on the pinion housing (bolted to the front of the differential) they are as follows:

    85140
    1Z5

    Does anyone know how to determine the ring size? gear ratio?

    any info will be a huge help. Thank you in advance for your time!!
     
  2. Jul 12, 2015 at 6:39 AM
    #2
    Utah

    Utah Misanthrope

    Joined:
    Jul 31, 2014
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    First Name:
    Kevin
    Land of Fake Beer
    Vehicle:
    The Gray Bastard
    3RZ, OME, 5.29s, 4.7, locked/locked
    Where are you getting that? 2002 4Runner has what's called the 8" rear diff (also called the "V6" or "turbo" diff), and the front is the 7.5 clamshell (different from the earlier 7.5's...). Ford has an 8.8" carrier, I don't know about the 6.7", that sounds tiny. Not sure what you're looking that at lists either of those as ring sizes for an '02 4Runner though?
     
  3. Jul 12, 2015 at 2:10 PM
    #3
    sntandrew

    sntandrew [OP] New Member

    Joined:
    Jul 11, 2015
    Member:
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    Messages:
    5
    Gender:
    Male
    South Carolina
    Vehicle:
    2002 Black 4Runner 4x4 SR5
    3" Rough Country Suspension Lift Rola Roof Rack 31.5 BFG AT KOs 2 Goal Zero Solar Panels
    Every parts house I call, looking for a pinion bearing, asks if the ring gear is 8.8 or 6.7. Even websites ask the same question. I just want to replace the outer pinion bearing and seal, not disassemble the the diff case to count teeth. I am calling the dealer tomorrow to see if they can shed any light on my question.
     
  4. Jul 13, 2015 at 1:03 AM
    #4
    Utah

    Utah Misanthrope

    Joined:
    Jul 31, 2014
    Member:
    #213
    Messages:
    194
    First Name:
    Kevin
    Land of Fake Beer
    Vehicle:
    The Gray Bastard
    3RZ, OME, 5.29s, 4.7, locked/locked
    That's new to me, I don't know why they're asking you that but I'm not a gear guy. Hit up Zuk at http://gearinstalls.com/, he'll know.
     
  5. Jul 14, 2015 at 4:45 AM
    #5
    sntandrew

    sntandrew [OP] New Member

    Joined:
    Jul 11, 2015
    Member:
    #760
    Messages:
    5
    Gender:
    Male
    South Carolina
    Vehicle:
    2002 Black 4Runner 4x4 SR5
    3" Rough Country Suspension Lift Rola Roof Rack 31.5 BFG AT KOs 2 Goal Zero Solar Panels
    Thank you for the info! The dealer gave me ratios only (3 possible choices) however, he said there should be a tag on the differential. One other helpful tip he gave me was if a tag is not present on the rear diff, look for a tag on the front diff because the part numbers and ratios are the same as the rear.

    TAG NUMBERS / RATIO PER THE DEALER

    A04A - 4:30
    A03A - 4:10
    The third option is not applicable.

    Once I determine what I have I will post the info here. I hope this will help someone else!!
     

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