Uhm.. do the brake lights come on, when you step on the brake pedal?
There is an interlock to keep you from shifting out of park w/out
holding the brake.
Usually ( at least in my '97 Blazer manual) there is a procedure
described, to get the vehicle out of park for towing or of the
interlock failes. It involves removing the boot (my shifter is on the
center console), and pressing a lever.
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