It's a pain. What else can I say? My 350 with TH350 came from the factory new and the cross member does cover the rear bolts on
the transmission pan. It's necessary to improvise; place the broad side of a chunk of 2X4 under the pan easing it up slowing after
removing cross member and mount bolts, move the cross member back slightly to gain access to the bolts, block the whole thing
in that position and remove the pan. Fortunately it doesn't have to be done often.