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ARB RD111 vs RD121 (2nd gen FRONT air locker)

Discussion in 'Technical Chat' started by xaqori, Jan 1, 2015.

  1. Jan 1, 2015 at 7:39 AM
    #1
    xaqori

    #1
    xaqori [OP] Grammer knotsy

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    ARB lockers and 4.88s front and rear, OME 886s, Dakars, etc., Safari Snorkel, 17"Fuel Revolvers w/ 35x12.50r17 KM2s, fenders cut 3" all around, Pioneer AVH-P4400BH w/ Backup cam, CB/PA (PA Installed), Weathertech Digis, Foglight anytime, AP: front bumper, skids, and pack rack, custom sliders, Warn 9.5XP, dual VIAIR 480Cs with a 2.5gal tank, OTRATTW switches galore, URD y-pipe, RCI skids, LF 240s, etc.
    It is almost impossible to find 4.88 gears for the RD111...They require short gears. Almost all 4.88 gears you get now are made taller to fit the
    $1,091 RD121 Air Locking Differential
    RD121 to be a more "universal" type fit. The gearing description for the lockers - like the 3.91+ for the RD111 or the 3.73- for the RD121 - is not completely accurate. The main gear manufacturers have just adapted the 3.91+ gears to fit the RD121 and stopped making the gears for the RD111. SEE ATTACHMENT OF SCREENCAP FROM ECGS'S WEBSITE. Both that are "$50" are made for the 3.73- carrier (locker)

    The one on the right is stock. The one on the left is what's supposed to be fitting in the exact same space (hint: it won't)

    [​IMG]

    If you make the same mistake that I did and are trying to source 4.88 gears, the gear part number from ECGS is T8CS-488R-NG. They are no longer made. Good luck...

    Gears.jpg
     
    xaqori, Jan 1, 2015
    #1
  2. Jan 1, 2015 at 10:18 PM
    #2
    AaronArf

    #2
    AaronArf Well-Known Member

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    Good info! Will definately keep this in mind when I order my lockers/4.88's
     
    AaronArf, Jan 1, 2015
    #2
  3. Feb 10, 2015 at 7:37 PM
    #3
    skygear

    #3
    skygear                    

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    Yeah, this is critical info.
     
    skygear, Feb 10, 2015
    #3
  4. Feb 11, 2015 at 5:12 AM
    #4
    xaqori

    #4
    xaqori [OP] Grammer knotsy

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    Yeah haha. It also sucks to learn this the hard way :eek:
     
    xaqori, Feb 11, 2015
    #4
  5. Feb 14, 2016 at 8:07 PM
    #5
    xaqori

    #5
    xaqori [OP] Grammer knotsy

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    Bump for information
     
    xaqori, Feb 14, 2016
    #5
  6. Feb 17, 2016 at 5:30 PM
    #6
    PSU Taco85

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    PSU Taco85 Señor Member

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    buy the ARB121 and sell the 111?
     
    PSU Taco85, Feb 17, 2016
    #6
  7. Apr 7, 2016 at 8:31 PM
    #7
    tacoma16

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    tacoma16 Well-Known Member

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    So if you want 4.88 gears and a front locker it can't happen, or do you have to order a specific arb locker? The 121 instead of the 111?
     
    tacoma16, Apr 7, 2016
    #7
  8. Apr 7, 2016 at 8:33 PM
    #8
    anthony250f

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    anthony250f Well-Known Member

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    You need the 121
     
    anthony250f, Apr 7, 2016
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  9. Apr 7, 2016 at 8:34 PM
    #9
    tacoma16

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    tacoma16 Well-Known Member

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    Okay great to know. Just wanted to make sure I was reading that right.

    Edit: went through ops build and it explained it pretty loud and clear. Getting a little late apparently.:pccoffee:
     
    Last edited: Apr 7, 2016
    tacoma16, Apr 7, 2016
    #9
  10. Dec 30, 2016 at 7:32 PM
    #10
    DistortedAxis

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    DistortedAxis Well-Known Member

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    Last edited: May 8, 2017
    DistortedAxis, Dec 30, 2016
    #10
  11. Nov 22, 2018 at 11:35 AM
    #11
    little squirt

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    little squirt 808 ALLDAY!!

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    808 ALLDAY!!
    little squirt, Nov 22, 2018
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  12. Nov 24, 2018 at 5:56 AM
    #12
    tacoma16

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    tacoma16 Well-Known Member

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    I don’t think it matters for 4.56. It was just for the 4.88’s in the front if I remember correctly from a year ago when I was searching this up.
     
    tacoma16, Nov 24, 2018
    #12

Products Discussed in

ARB RD121 Air Locking Differential
$1,091.00
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