Reverse manual valve body questions

Thanks, that’s a great read. I have slowed down in gear all my life and have never had a crank problem. Same with hauling campers, boats, and any other kinds of trailers that almost require u to down shift a gear or 2 when decending a steep grade. Never a problem. I put EFI live into my diesel truck, when slowing down pulling a load it down shifts on its own. Just stating what I lived and learned. Kim