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Thread: Diff question

  1. #1
    RC Enthusiast
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    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
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    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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    Thanks the answer I was looking for =)

  4. #4
    RC Qualifier
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    The rear axle has a differential inside also

  5. #5
    RC Racer
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    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 Competitor
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    Feb 2020
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    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 Qualifier RCWilly's Avatar
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    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
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    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
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    Apr 2018
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    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...��

  10. #10
    RC poster
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    Apr 2018
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    Wait a minute, I see 2 diff cups, 1 in the center and one in the front, none ion the rear as it is posi-rear drive. No diff action in the back. there is a way to get diff action by replacing the locked spool with a proper diff assembly.

  11. #11
    RC Competitor
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    May 2020
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    59
    Center diff has million weight oil in it. So it's basically locked but can be forced to turn.

  12. #12
    RC poster
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    Jun 2020
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    Are you guys running stock rear ring and pinion or heavy duty new to forum sorry if I’m in wrong thread

  13. #13
    RC poster
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    Jun 2020
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    I ordered a set of GPM #45 Steel Ring and Pinion because I blew out two stock ones. Both my fault for the most part, but not the most fun to replace.

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