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  1. #1
    RC Racer
    Join Date
    Jun 2017
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    Belgium
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    141

    Diff binding in the diff housing

    Iím building a new car.

    After I put the front and rear differentials in the diff housing and tightened the screws snug, I noticed that the differential wasnít free spinning in the diff housing.
    It was binding somewhere, I couldnít see where.

    After loosening the screws a little (the screws that hold the diff housing and the shock tower), the binding was gone.
    Is this normal ?

  2. #2
    Marshal Double G's Avatar
    Join Date
    May 2008
    Posts
    13,741
    Tighten until the screws touch the plastic and then a little more for good measure. Any tighter and the plastic diff housings or bulkheads will deform.
    The Super Derecho

  3. #3
    RC Racer
    Join Date
    Jun 2017
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    Quote Originally Posted by Double G View Post
    Tighten until the screws touch the plastic and then a little more for good measure. Any tighter and the plastic diff housings or bulkheads will deform.
    Thanks for the advice.
    It's the first time I noticed this, it didn't happen before.

  4. #4
    RC Turnbuckle Jr.
    Join Date
    Feb 2002
    Posts
    9,411
    also, something often overlooked is the screws that go into the bulkhead can actually go too far and hit the ring gear....

    make sure they are absolutely the correct length, even a small 2mm difference can make it rub. 2mm is really easy to overlook

  5. #5
    RC Champion
    Join Date
    Apr 2018
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    1,043
    Even tightening the stock screws too tightly can affect the way the diff works. Been there and done that.

  6. #6
    RC Turnbuckle Jr. El Sob's Avatar
    Join Date
    Feb 2010
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    Indianapolis
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    14,321
    Quote Originally Posted by StijnH View Post
    I’m building a new car.

    After I put the front and rear differentials in the diff housing and tightened the screws snug, I noticed that the differential wasn’t free spinning in the diff housing.
    It was binding somewhere, I couldn’t see where.

    After loosening the screws a little (the screws that hold the diff housing and the shock tower), the binding was gone.
    Is this normal ?
    I believe I have experienced exactly what you are talking about. The two screws that attach the rear differential housing to the bulkhead. They are in the upper corners of the cover. With the rear bumper on the truck they are challenging to get to. On one of my trucks I have to keep them a little loose so the differential operates properly. This started after I installed the Stampede slipper clutch.
    Member of the 10,000 + posts club! Here to help!

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