I wouldnt if its not slipping. Is there a shift flare from 1-2? If Im not mistaken thats usually a telltale sign the 5r55s needs a rebuild.
I had problems with my 85 ltd where it would get stuck in high idle so Id throw it into neutral when stopping so I wouldnt have to mash the brakes. I accidently put it into reverse and immediately shifted back into neutral lol. It was fine for the rest of the time I had the car and the aod isnt the strongest trans.
07 GT Tungsten Gray
02 GT Mineral Gray
98 Crown Vic P71