Home › Forums › The Track › Tolerance for monoball control arm bushings

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    • Shannon Whitehead
      Keymaster
      April 8, 2019 at 6:08 pm
      Post count: 274799
      #490653

      Monoballs should have no perceptible movement (slop). Time to Change. I would change them at this point but I would replace both on a control arm not just one.

    • Shannon Whitehead
      Keymaster
      April 8, 2019 at 8:15 pm
      Post count: 274799
      #490661

      TX, reach out to Dan Cragin at SPT, he has a lot of experience with mono-ball set ups and can get you what you really need reasonably

      (310) 597-6295

    • Texaspettey
      Member
      April 9, 2019 at 9:20 am
      Post count: 25
      #490697

      RedTanRT/10 said:
      TX, reach out to Dan Cragin at SPT, he has a lot of experience with mono-ball set ups and can get you what you really need reasonably

      (310) 597-6295

      Thanks. Dan has been great help to me with other areas of the car.

      steve911 said:
      Monoballs should have no perceptible movement (slop). Time to Change. I would change them at this point but I would replace both on a control arm not just one.

      Appreciate the advice. I’ll do them both. The front driver side seems to have taken extra wear. Wheel bearing and ball joint both went out on there already. Not surprising that the control arm bushings would take a hit also.

    • J-rho
      Member
      April 9, 2019 at 8:35 pm
      Post count: 19
      #490783

      Dan is great (has done lots for my car) but if you want to get back to the one who put that car together, can contact Erik Messley at EMI.
      I knew a previous owner of the car. Does it still have the Caldwell motor?

    • Texaspettey
      Member
      April 12, 2019 at 11:57 am
      Post count: 25
      #491082

      J-rho said:
      Dan is great (has done lots for my car) but if you want to get back to the one who put that car together, can contact Erik Messley at EMI.
      I knew a previous owner of the car. Does it still have the Caldwell motor?

      Thanks. The previous owner had Jim Justice rebuild the motor due to some issues. That rebuild was to be close to what Caldwell had done, but Jim didn’t fully remember the details. It is holding up well from the last rebuild that was done. (Knock on wood). However, it did dyno low (440RWHP) relative to previous runs that were done on the Caldwell build. That may be a tune which is on my list to work with Dan on once I get all the suspension items worked out.

    • MomentaryRacing
      Member
      April 16, 2019 at 12:52 pm
      Post count: 67
      #491608

      make sure it is not the upper joint (between the spindle and upper CA). that one is likely to wear first, before race-quality monoball joint does.

    • Shannon Whitehead
      Keymaster
      June 11, 2025 at 3:03 am
      Post count: 274799
      #33290

      In diagnosing a clunk, I found some small movement in my upper front control arm. It’s very small, I’d say 1/32″ or so. I need to put some serious back/forth action on the wheel on the lift to notice it. The control arms move freely up/down with no perceivable noise or friction. The car has monoball bushings on all the control arms, installed around 2002. It is Paul Mumford’s old 2001 ACR, so it has seen a lot of track time. I don’t have experience with monoball bushings. Is there a level of normal tolerance for front/back play in the control arm bushings or is this an indication of wear? Given the cost of new monoball bushings, I’d like to avoid replacing if it is normal.

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