Alan, You ask a huge question as there were many detail differences that took place when the Imperial was dropped and the NYB took the design of the Imperial. I know from experience that there are a great many differences in the interior. The carpet padding, sound insulation, etc were all much thicker and heavier in the Imperial than in the NYB. I have also been told that the power seat motors where scaled back to conserve weight as the cars were eventually 'slimmed down' to improve economy. I always liked the disk brakes on my 75 Imperial and never had any problems with them. I also owned a 76 NYB and could tell the difference between the cars in how quiet the Imperial was over the NYB and both and similar amount of miles on them. Unfortunately my brother has used both in demo derbies and I was amazed to see how many detail differences there were in the underlying components of the two cars. It just goes to show that although the exterior wrapping looks the same, the total package is different. Happy motoring Dale 68 Crown Coupe 60 NY T&C, Sedan, 2 door, 4 door 71 NY sedan