Re: 2001 Grand Marquis Info and Pic.
Other than the heavy duty suspension, the police versions had the same engine. They had dual exhaust, ECU would make it shift later and the differentials were geared higher on most. An oil cooler and a few other changes that for our use don't make a big difference. Mine had 135,000 hard miles put on it and it now has 154,000 and runs like new.