Thank you for the response. I seem to remember since the trucks have the bellhousing crossmember, it is a difficult situation to put in a third crossmember and get the driveline angle right and things not be in a bind. Something like that. Have you heard of anything like that?

Just for my peace of mind, I wouldn't want to install it without a trans crossmember either but I know the factory cast iron ones weren't. I wished I could remember what I heard/read about that.