OK The floor pans sag a little over time. Mostly because of people with 'big feet' in the back seat. Another reason the clearance gets tight is the shrinking original rubber subframe mounts. Take a big hammer(rubber if you got it) and force one end of the cross member back and the other forward. It will wedge up against the floor pans a little. The floor pans will 'give' and the cross member will come out. It's a mixture of thinking and brute force. Not too much of either.