Originally Posted by NERV
i think the jeep wrangler is the longest run without significant change to the design
Only cosmetically. The Land Rover Defender beats it there, as it has been around since WWII with major changes to the motor, but only refinements to the frame.(Yes I know it doesn't qualify because it'* a Brit)
Or how about the Original VW Beetle? It was produced from prior to WWII up until about three years ago with no changes at all. When they stopped making it in Europe, the Mexico plant took over production and didn't stop until 2002.