Chevrolet's full-size Express van is on a roll, gaining more market share than its competitors and introducing a new upscale model for 2001. For the 2000 calendar year through September, Express gained 2.4 percentage points of market share compared with the market share losses of its non-General Motors (NYSE: GM) competitors. Sales for the period were 89,838, a 10-percent increase from the year-ago period.