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Thread: Diff question

  1. #1
    RC Enthusiast
    Join Date
    Aug 2009
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    44

    Diff question

    Just recently picked up a used UDR. Does this truck have a center and rear diff? Doesnt feel like it does (feels like the center and the rear are locked turning at all times), so thought I ask

  2. #2
    RC Racer
    Join Date
    Jun 2018
    Posts
    128
    It doesn't have a center or rear diff. It's a live solid axle in the rear. It does have a front diff.

  3. #3
    RC Enthusiast
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    Aug 2009
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    Thanks the answer I was looking for =)

  4. #4
    RC Qualifier
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    Dec 2017
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    North Texas
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    631
    The rear axle has a differential inside also

  5. #5
    RC Racer
    Join Date
    Jun 2018
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    128
    Not much of a diff .. as compared to 1/10 and larger scale buggies, race cars, etc. It's more of a gear reduction than a diff ... imo

    Even a Maxx 4S diff is massive compared to the 'diff' in the UDR. Xmaxx - also large.
    Last edited by TraxxasTigger; 03-02-2020 at 04:52 PM.

  6. #6
    RC Enthusiast
    Join Date
    Feb 2020
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    33

    Diff question

    Quote Originally Posted by pbadcat View Post
    Just recently picked up a used UDR. Does this truck have a center and rear diff? Doesnt feel like it does (feels like the center and the rear are locked turning at all times), so thought I ask
    The rear diff is locked and the center is a badass torque biasing unit from the XMaxx. Since you have a used one you probably donít have the box that tells you what the truck has


    Sent from my iPhone using Tapatalk Pro
    Last edited by dbestfromclovis; 03-15-2020 at 07:23 PM.

  7. #7
    RC Racer
    Join Date
    Feb 2019
    Location
    California Bay Area
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    177
    It has a front diff and center diff. It comes with a spool diff (locked diff) on the rear, but you can replace the spool with an actual differential (part #8576).

  8. #8
    RC Racer
    Join Date
    Jun 2018
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    105
    Quote Originally Posted by RCWilly View Post
    It has a front diff and center diff. It comes with a spool diff (locked diff) on the rear, but you can replace the spool with an actual differential (part #8576).
    Open the diff.......it makes the truck more fun to drive!

  9. #9
    RC poster
    Join Date
    Apr 2018
    Posts
    6
    I like the locked rear diff, Posi rear�� I control it during the turns and minimize hr rollovers. Once in a while I actually want rollovers... it pleases the crowd especially when it winds up o its feet and drives on and on and...��

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