IMHO, the primary reason for the one x-member was supporting the tranny driveshaft carrier bearing, something that you no longer need to do -- I think you can support the gas tank with an arm from the frame. As thin as that x-member was, it really wasn't doing much.

IMHO, the primary reason for the transmission x-member was supporting the tranny -- something your new crossmember does nicely. Yeah, there was pretty good beef to that X-member, but I think that was more about supporting the tranny and skidplate and less about holding the frame rails together.

I may eventually add a removable crossmember connecting the engine mounts, but I'm happy enough the the FROR crossmember by itself. YMMV.

Randii