User Tag List

Page 1 of 3 123 LastLast
Results 1 to 10 of 23

Thread: What's my gear ratio??

  1. #1
    She-Jeeping Jarhead LeafspringMARINE's Avatar
    Join Date
    Nov 2008
    Location
    Longview, TX
    Posts
    1,046

    Branch
    Marine Corps
    Status
    Served
    Served
    1993 to 1997

    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default What's my gear ratio??

    The million dollar question....

    How do I find out what my gear ratio is so I can get the correct rear end from the junkyard? I even called the Jeep dealer & the service guy said he "didnt know". WTF??
    Meghan - MY KID CAN PICK OFF YOUR HONORS STUDENT AT A CLICK AND A HALF !
    • Freedom is never more than one generation away from extinction. We didn't pass it to our children in the bloodstream. It must be fought for, protected, and handed on for them to do the same.
      Ronald Reagan

  2. #2
    Rock crawling Infidel BucketOKarma's Avatar
    Join Date
    Mar 2008
    Location
    Northfield
    Posts
    1,640

    Branch
    Army Reserves
    Status
    Serving
    Served
    2005 to Present

    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    What are the drivetrain specs of your jeep (engine size, auto trans, or std?) and has it been geared before? You're looking for axle gearing, not the ratio, that's a tranny/transfer case thing ( I think, but I'm not quite certain, so I might have made a fool of myself).

    Look at the rear axle, next to or on the rear diff, should be a metal tag. Your gearing will be on that tag if it's still there and readable. If not, check your front diff for the same tag, and read that, again, if it's still there and readable. If your jeep has been geared before, the tags might have been removed.


    I really hate to say it, but you might want to check the Jeepforum tech area, find your jeep in the stock specs section, and figure it out there if you can't find what you're looking for here.
    - Shane

    2000 TJ 2.5L SE, 2" spacers and XJ springs up front, Crown-Vic springs in the rear, Edlebrock shocks, 33" Dayton M/Ts, JKS discos, SYE/CV shaft, Warn gastank skid, 4.88 gears ShrockWorks sliders, OX locker, Camo soundbar, and 04 Willys Edition front seats, still LOOKING FOR A MATCHING REAR SEAT.

    HeavyMetalConcepts.com

    CampMJ.com

    SISOffroad.com

  3. #3
    Got Beer airforce26yrs's Avatar
    Join Date
    Jan 2009
    Location
    southeast michigan
    Posts
    4,182

    Branch
    Air Force
    Status
    Retired
    Served
    1965 to 1991

    Mentioned
    7 Post(s)
    Tagged
    0 Thread(s)
    I'm Mike, make sure you spell it right, because I do not want to get the wrong A$$hole in trouble.

    If you do not have time to do it right the first time, how do you have time do do it over?

    www.jeepforum.com michiganmaveric

  4. #4
    Wheelin requires wrenchin Doppler's Avatar
    Join Date
    Jan 2010
    Location
    Newcastle
    Posts
    2,695

    Branch
    Air Force
    Status
    Retired
    Served
    1990 to 2010

    Closest Installation

    Tinker AFB
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)

    Default

    Intead of dropping the drive shaft you can also tape a piece of string, 18 to 24 inches long, to the bottom center of the drive shaft, then turn the tire the necessary revolutions depending on differential type, and then count the wraps of the string. 3.5 wraps is 3.55:1; 3.75 wraps is 3.73:1 and so on. Good luck!

  5. #5
    Gypsy Roll BomberJeep's Avatar
    Join Date
    Nov 2008
    Location
    Virginia Beach
    Posts
    449

    Branch
    Navy
    Status
    Serving
    Served
    2001 to Present

    Closest Installation

    NAS Oceana
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)

    Default

    Your rear diff should have a tag on it saying what gearing is in there. If not you could get a build sheet from your local stealership for free just give them your vin
    IYAOYAS
    Jeepers do it wherever

    /l ,[____],
    l---L -OlllllllO-
    ()_)-()_)-o-)_)

  6. #6
    Senior Member jackhammer's Avatar
    Join Date
    Mar 2010
    Location
    chicago
    Posts
    1,238

    Branch
    Army
    Status
    Served
    Served
    1990 to 1993

    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)

    Default

    manual yj 4cyl is 410
    auto yj 4cyl is 373
    Its only when you get into the 6cyl that its a game.

  7. #7
    Newbie MJMPC's Avatar
    Join Date
    Apr 2010
    Location
    Elizabethtown
    Posts
    14

    Branch
    Army
    Status
    Served
    Served
    1966 to 1969

    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    With all the mods people do it is hard to tell. Best thing is to pop the diff cover and look at the numbers on the ring gear.
    Mike

    MJM Powder Coating

    Etown Ky.

  8. #8
    Senior Member jackhammer's Avatar
    Join Date
    Mar 2010
    Location
    chicago
    Posts
    1,238

    Branch
    Army
    Status
    Served
    Served
    1990 to 1993

    Mentioned
    3 Post(s)
    Tagged
    0 Thread(s)

    Default

    The numbers on the ring gear need to be divided on the dana 30. Not sure on the 35. If I remember correctly theres 2 sets of numbers and if you divide them by each other you get the ratio. My 8.8 just had the ratio marked on the ring gear

  9. #9
    Mud Puppy Grevus's Avatar
    Join Date
    Feb 2010
    Location
    The great white north
    Posts
    816

    Branch
    Army
    Status
    Serving
    Served
    1995 to Present

    Closest Installation

    Fort Drum
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    I used to know a formula that would take your tranny low gear, transfer case low gear and your ring and pinon gear ratio and tell you the over all gear ratio.. I think it's just adding them together but I don't remember..
    `89 YJ 33's 4" lift, High-lined front and rear "The Mistress"
    ** NOTE TO SELF** it is illegal to stab stupid people in the eye with a pencil

  10. #10
    On your SIX! highlandercj-7's Avatar
    Join Date
    Jun 2008
    Location
    Winchester VA
    Posts
    1,487

    Branch
    Air Force Reserves
    Status
    Serving
    Served
    1991 to Present

    Closest Installation

    Andrews AFB
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    The front diff usually has a tag on it that is most legiable. Most common in a YJ are 410's, 355's and 307's.
    HighlanderCJ-7

    If you don't stand behind our troops,
    Feel free to stand in front of them!

    ...There can be no divided allegiance here. Any man who says he is an American, but something else also, isn't an American at all. We have room for but one flag, the American flag... We have room for but one language here, and that is the English language... and we have room for but one sole loyalty and that is a loyalty to the American people.'
    Theodore Roosevelt 1907

Page 1 of 3 123 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Get the MJ Supporter Membership for a little less than $0.06 a day and get more space, 2 MJ Stickers and no banners ads. [Check it out]