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You don't need to cut the whole tunnel out, just the part where the 4x4 removable pan goes and the rear portion where the t-case goes.
I guess what I was trying to say was at the front from the firewall to the front of the seat hump, depending on your tunnel (most autos had a low tunnel) you just have to cut open the lip portion for the 4x4 piece to bolt back into. Behind the seat hump you have to cut it out.