Hi all :) im currently building a LS1 manual conversion to an GU zd30 auto, has anyone had good experiences with the manual 5 speed from eather an zd30/ td42/ tb42/ tb45/ tb48 Behind the LS1/ LS2? And Which of these boxes would have the strongest internals and will they all bolt up to the dellows bell housing? Any info would be greatly appreciated :)