I I'm not mistaken , these years use 8.25 inch diffs.... I'd look for a Diplomat cop car Sure grip diff, measure( I bet the dimensions are the same) and swap (take the rear sway bar too...) Matt ( 74&75 Imperials,77T&C, 85 Aries, 86 5th Ave) Phil Brust wrote: > Recently, Dick Benjamin stated that the ratio was 2.20:1. No wonder I can't > get the tires to chirp. Seriously, I think I'd be a lot happier with 2.7 or > 2.9. > I've never done anything to a rear axle...how's this done? Is it better to > swap axles? What would work? > > Phil Brust > Jefferson GA > 1982 Imperial >