Pontiac Firebird Transmission Problem

Looking for some advise on how to fix a transmission problem with my car. It is a 95 Firebird 3.4 automatic. Car runs great, except for; when car is cold I can NOT push button in to shift it into any gear. I
have replaced trans fuild, filter, shift lock switch. Can anybody tell me what I should replace or check next, PLEASE??
Thanks Mike
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Can u temporarily straight-wire the shift lock switch? This will let u know if the actuator (probably depressing the brake pedal) is in deed activating the switch properly. If not, u may just need pedal-to-switch adjusted. .s
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Thanks I will look at that next.
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Thanks I will look at that next.
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