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  1. #1
    RC Qualifier
    Join Date
    Jan 2011
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    969

    Loose diff assembly inside bulkhead

    hi guys, do any of you know what keeps the diff snug inside the rear bulkhead?

    ive replaced the outer diff bearings and the rear bulkhead itself, but the diff just feels like its floating inside the bulkhead and there is a lot of play that makes it hard to drive.

    any ideas would be appreciated. here is a vid if it helps

    https://www.youtube.com/watch?v=OAIrxrQQZuM
    https://www.youtube.com/watch?v=ustn4b-abhg

  2. #2
    RC Qualifier
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    Jan 2011
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    969
    FYI I solved it by soldering 2 holes at the top and bottom of the bulkhead and zap strapping it down. Snug as a bug now



    https://pasteboard.co/JllDpb8.jpg

  3. #3
    RC Turnbuckle Jr. olds97_lss's Avatar
    Join Date
    Dec 2003
    Location
    Dekalb, IL
    Posts
    3,369
    There's a little clip that goes on the chassis and holds the front neck of the diff in place. Actually, that was the nitro revos. The ERBEv1 has them molded into the bottom of the chassis.

    I'm pretty sure the movement your seeing on the output cups is due to wear on the shaft/cup/ring gear where the output shaft comes out. It's not the whole diff moving around. The movement your seeing when you lift/jiggle the center shaft is due to not having the chassis on it which would lock it down into the bulkheads.

    I put a red box around the part of the chassis that locks down the neck of the diffs, sorry I don't have a photo of an actual chassis to show you.


    Found a photo online of it and put boxes around them:
    Last edited by olds97_lss; 08-08-2020 at 02:34 AM.
    https://www.youtube.com/c/olds97lss

  4. #4
    RC Qualifier
    Join Date
    Jan 2011
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    969
    thanks for that, good to know.

    my chassis is only a year old, but i guess the flex could be gone so its not holding it down as tight as it should. almost feels like a design flaw that there are only 2.5 screws holding that rear part of the chassis to the back of the rear bulkhead (unlike the front)

    unfortunately even the zap strap didnt solve my speed wobble problem (but ill use another thread for that)

  5. #5
    RC Champion grizzly03's Avatar
    Join Date
    Dec 2014
    Location
    Adirondacks
    Posts
    2,271
    You can try using a hot glue gun. You fill in around the diff to help hold it in place from moving around. And when you need to work on the diffs you should be able to remove the glue without damage.

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