We've sorted the Thunderbird into generations, which is a collection of years where the Thunderbird was continuously produced and very few, if any, changes are made. Sorting models by their generation gives us a clearer roadmap of potential problems.
Is our generation data perfect? Nah. Truth is manufacturers don't always make it clear when a new generation begins. But we do our best to keep our generation data as accurate as possible so we can predict problems and help you out. Use it as a guide for making your decisions. Or don't (but you really should).