8" converter on the highway ??

I have ran 3 different 8" converters in my barracuda, a 5200, a 6600, and a 7200 all with different gear ratios of 4.10, 4.30 and lastly 4.88's. All were built knowing ahead of time that it was a street/strip car and were built on the tight side although the 7200 is the loosest as it had to built that way to still perform. I have driven them all on the highway here in Kansas City but none of them would go on 15 mile type trips and I also kept the RPM in check so I usually was running 55-60 mph and obviously constantly getting passed by......but to your point I have and experienced no problems with any of them.