Suspension. My GTX from pitman to torsion bars are heavier than my Duster. And not sure a Dana rear was available to a '74 A-body? (But maybe?) I wish they had beefier brakes? My first GTX was drummies all around. That was not a cool. This GTX has the dealership option front disc's. Much improved. By '74? Front disc's were the norm. So comparing a '69 to a '74 is not quite apples to apples. But it's what I got. Cory's Plymouth stable.