My 95 chevy silverado won't shift from park. It especially won't shift out of park when it's 80 degrees or warmer outside. I get it into neutral then start it and shift into drive to go. It has 114000 miles on it and is a 4 wheel drive with a 5.7. I am thinking the brake light switch but the brake lights all work.

. Spray the brake light switch mechanism with WD-40. Check its adjustment.

. Check/replace the neutral starter switch and its adjustment.