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Enjorten I re read your post and saw your header on passenger side ear on transmission. I thought it was hitting frame. Yea mine did same thing about 1/2-3/4 inch had to be shaved off. Don't know of a header that will clear frame and transmission ear. Cause they half to hug block tight to clear frame. I'm sure someone could cut and rebend header to not do that, if you found a really good custom guy. I've seen that done on some TV shows lol. Wasn't on crew cab Ls swap but just in general. I choose that route over notching frame. If header comes out more from block it hits frame then when you notch frame. Won't hit ear on tranny. If they hug block tight to clear frame then it hits eat on tranny. Double whammy lol. But maybe someone will chime in, that has found away to clear frame and ear. But I don't see without some custom work on header.