The shifter housing/casting in my 78 GTS is loose and it seems like it should be rigid. What I mean is that the shifter gate is rigidly screwed to a cast housing and sandwiches some of the tunnel top surface in the process. When I shift, the shift gate and tunnel move a little making alignment of the shift linkage imprecise. It turns out that the fiberglass tabs that fix the tunnel to the floor, are not as rigid as they should be and allow the tunnel to move and deflect somewhat. Still, it seems the shifter housing should be rigidly fixed to the floor in some positive way and this should lend some support to the fiberglass tunnel, not the tunnel lending support to the shifter casting. Am I missing something? How do I fix/adjust this?