Ford sold 213,500 Expeditions in 2000, but just 90,300 last year.
It's Ford's full-sized competitor to the Chevy Tahoe and - in the Expedition EL version - the Chevy Suburban.
Recent design and engineering changes gave the Expedition more sophisticated rear suspension for improved ride and handling.
But that hasn't been enough to boost sales, especially after a major top-to-bottom redesign of the Tahoe and Cadillac Escalade that gave them much better fuel economy. To make things even tougher, Toyota entered the market with a larger, redesigned Sequoia.
NEXT: Chevrolet Tahoe