Cool pictures, looks like a ton of fun!!!!!
I get it now.
Looks like you chose an aftermarket sending unit, good luck with that. The crossmember is for the shocks and to return some "shear" to the rear end? Having removed the spare tire members and all 3 of the other crossmembers, i spose you'll need it. As well looks like your running one leaf and an overload, side to side movement of the rear end is being controlled by a panhard or track bar? Maybe just a solid leaf bushing to hold it in place?
Looks great man!! You prolly shaved 250 pounds, very nice
panhard ASAP
One more crossmember might come out,Its the one sitting behind the torsionbar crossmember.....Not sure yet