Hi all. As an emission Inspector the majority of vehicles that come in get driven on a dyne i.e on rollers to simulate driving. Now my question is this- Most two-wheel drive vehicles can be driven on a two-wheel drive dyne , EXCEPT several years of Toyota Avalons, one or two years of Camry, 2000 and newer Dodge Durango, mid 90's Lincoln Towncar, certain Toyota 4Runners with 4 wheel drive selector, and a few E series and S Class Mercedes Benz's. There is a sticker that reads something to the effect "This vehicle must be driven on an all-wheel-drive dyne or transmission damage may occur." 99.9% of the front or rear wheel drive vehicles don't have an issue. Its a few odd vehicles that nobody seems to know why they are this way. Anyone?