TRE only use the factory synchros from Mitsubishi.  Are they brass or are they bronze? Who the fuck knows but some of you funny guys want to pretend that you're a BMW owner or something worse. Nobody should being using anything other than the factory synchros if you want your transmission to shift good. TRE has been modifying the blocking stops on the synchros and engagement teeth on both the gears and sleeves for over 20 years, it's old news.

FYI: Did you know that the old fiber lined synchros from Mitsubishi actually have a higher friction coefficient than the "bronze" synchros... do some research people.

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