I will not be using an official shop to do it. 2 master mechanics that are close friends will do the installIf you or a buddy will not be installing the gears, do not buy them on your own to give to the installing shop trying to save a few dollars. Instead have the installing shop provide ALL of the parts. Every single one of them. That way if/when there's any type of problem during or after the installation they can't blame your parts. And there will be no warranty issues if the shop provides all of the labor and parts.