Sonnax Parts & Accessories

Sonnax engineer the parts that fix the things Harley got wrong — upgraded valvebody internals, transmission bearing kits, and engine components that solve known weaknesses on factory drivetrains. The transmission work in particular is what gearbox builders reach for when they're rebuilding a Twin Cam six-speed and don't want to put back the same parts that failed.

Permanent fixes rather than like-for-like replacements. If a transmission has come apart once already, this is the kit that should go back in.