I like heims best for race cars. Now that Currie Jonny joints and Rubicon Express ends are available there`s no reason to compromise. They`re not much more expensive and they`re weather sealed,rebuildable and offer some NVH isolation. We`ve tried Seal-Its. They`re better than nothing. They don`t work in some double shear applications due to the thickness of the washers the rubber is vulcanized to. They keep grit out better than water but again they`re better than nothing. I`d still just go with Rubicon or Currie joints for the small difference in price. Marcus
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