Slogs the 2.77 final drive ratio on the 360 Diff would have made for a nice highway cruising with fairly low RPM. My ZD Fairlane had a 2.72 diff and the 351 Cleveland was hardly revving at 100kmh. I never took it to 180kmh like you did with the Chrysler! (maybe close, like 160kmh) The fastest I have driven my Mustang is 90mph (144.841kmh) and although it was still accelerating I backed off because I wanted to keep my License ! (the local law man in that area drives a Holden Ute) Ah, well, you have had some good experiences with Chrysler and fellow owners would agree with your praise. My earliest experience in a Valiant was as a passenger in my Cousin's hot RV Val (below) when I was a teen.