Where is the neutral safety switch on buick park avenue?

The neutral safety switch on a Buick Park Avenue is located on the transmission. However, pinpointing the exact location without knowing the year of your Park Avenue is difficult. It's usually either on the side or top of the transmission, near where the shift linkage connects.

Because of its location and the need to work around the transmission, accessing it often requires some mechanical skill and potentially dropping the transmission pan or at least partial disassembly. It's not a job for a novice. If you are not comfortable working on your car's transmission, it's best to take it to a qualified mechanic.