"The 1975-1980 model Granadas and Mercury Monarchs came equipped mostly with 8-inch rear ends. Some were also equipped with an 8.7-inch rear end --identifiable by a removeable rear cover (not desirable). Some models also had drum brake equipped 9-inch rear ends while a few had the optional 9-inch rear ends with factory-instastalled disk brakes.
The 1977-1980 Lincoln Versailles came standard with the 9-inch disk brake rear end. However, there are only four ratios to be had with any of these rear ends. They are: 2.47:1, 2.50:1, 2.75:1 & 3.00:1. Good for gas mileage purposes, but not good from a performance stand-point. Most of these 9-inch 3rd members came as a Conventional (single track) 3rd member. Some had two pinion (spider gears) Traction-Lok differentials, while some had the stronger four pinion Traction-Lok differentials."
