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  1. #1
    RC poster
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    Jan 2018
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    Los Angeles
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    4

    Drivetrain backlash - what's normal?

    How much backlash is normal for the drivetrain of the Summit? If I place the car on a flat surface and roll it backwards until the motor turns, I have to then roll it about 1/8 to 1/6 of a tire rotation until the motor turns in the opposite direction. Is this normal for yous guys? (The car is brand new, just out of the box.)

  2. #2
    RC poster
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    Jan 2018
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    I just measured it: I need to roll the car 3 inches to take up the drivetrain backlash. This seems like a lot to me.

  3. #3
    RC Competitor
    Join Date
    Oct 2011
    Posts
    83
    Yes it's normal. The backlash is play not he center diff. There is a forum out there of someone making a custom engagement part to prevent the backlash. Don't hold me to the name of that part. I'll find the part number and post it

    Sent from my SM-G955U using Tapatalk

  4. #4
    RC Racer Trentbaby65's Avatar
    Join Date
    Feb 2017
    Posts
    211
    LEM have a fix for this
    LEM 212 Summit dog carrier. All but eliminates that issue

  5. #5
    RC Competitor
    Join Date
    Oct 2011
    Posts
    83
    3985x is the part. Notice the part on the left has 2 drive dogs on either side. This slides into the larger 3985x on the right. Notice the 2 slots are larger then the drive dogs. That play you feel is caused by the size difference.

    Sent from my SM-G955U using Tapatalk

  6. #6
    RC poster
    Join Date
    Jan 2018
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    Los Angeles
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    Great and fast responses! Thanks for the fast and accurate info!

  7. #7
    RC Competitor
    Join Date
    Oct 2011
    Posts
    83
    The funny part is I work in a machine shop and was thinking of this today, thinking about making one to take the backlash out. Was thinking aluminum maybe, or some stainless steel

    Sent from my SM-G955U using Tapatalk

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