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I have seen them in teflon, nylon and delrin. I have not seen bronze. I like the teflon ones best so far.

 

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How do the teflon hold up to the high steer? Do you knoew who has them?

They are spec'd by spicer to be teflon. They hold up pretty well, depending on what type of abuse you give them. If they don't arrive in a spicer box they aren't. Seems like some generics are nylon and some are a cheesy hard plastic that is prone to cracking.

 

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I'm not sure if it is teflon or Derlin, but Class 8 trucks use the 'plastic' bushings with no problems, so I don't know if there is much point in going to bronze.

Likely teflon, the delrin units I have seen are custom.