That also may be true but I have a set of very new true track a arms and carriers and they have fit like junk since day one. When I was putting everything together the bearing would fall out if you flipped them upside down. After reading a lot of forums I wish I didn't buy that set up because of issues just like the ones I am having. I would run there a arms again, but I am sure that I personally will never be running any of the carriers on anything that I own. The reason the problem because a bigger problem in my case is the fact that I put the mip axles on it and thinking I had to shim the axles to tighten things up in the rear I noticed it was the bearing moving in the carrier. I know it is the carriers because I am running stock Revo's in the front and I didnt run into any of these problems.