I just has this problem; so get under the car and look for the linkage that connects the trans shift rod to the shift bar. This bar is attached to the trans and runs under the torsion bar to the frame on the drivers side.

At the frame is a rod that comes from the column shifter and attaches to the bar. This is where the shifter adjustment is.

Loosen the adjustment and disconnect the shifter rod from the bar. Then follow the shift bar linkage to the trans and find the short arm (3") at the trans left rear that actually shifts the trans into park and other gears. Push the arm all the way back until it clicks into Park. Shake it settle it in and just reattache the shifter rod to the bar.

Run through the gears from the front seat to check. This is a simple procedure.