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Which would provide the smoothest ride --i.e minimal vibration?
My understanding is that the LS 430 ultra luxury has air suspension, whereas the LS 460L has a 7" longer wheelbase. All things being equal, a longer wheelbase would be smoother; however, I wonder how the air suspension fits into the equation...
I have a '07 460L non-air and my parents have an '06 430 on air, and I think the 430 is smoother. But as Iceman mentioned above, my guess is the 460L with air would be the smoothest.
i owned ls460l with air, and i have driven a lot of ls430 ul (never owned one), honestly i think ls430 ul rides smoother. it has a softer suspension imho