On the cop car 8.25 axles, definitely check to see what ratio is in the axle before buying it. Some of the non-pursuit cop cars were set up for economy. If I'm not mistaken, for a year or two the 2.26 axle was available in the cop cars. These cop cars were used for administrative duties, etc.

I had a 1983 Grand Fury years many years ago. It had a 318 with a 2 bbl carburetor and the high gears in it. I discovered it was used at a prison. The car had the police package on it. In fact, it was the nicest driving M body ex-cop car I ever drove.

I believe they also made an axle with 2.4? gears as well in some years. I believe I may still have it in the parts stash.... I believe that axle came out of a Aspen.