Upon its 1990 release, the Lumina APV was powered by a 3.1L V6, producing 120 hp; a 3-speed automatic was the sole transmission offering. For 1992, a 3.8L V6 became an option, introduced with a 4-speed automatic. For 1996, both engines were replaced by a 180 hp 3.4L V6; the 3-speed automatic was discontinued. Distinguished by its large windshield and sloped hoodline, the Lumina APV was of a "one-box" design, a configuration similar to the Ford Aerostar and Renault Espace. In line with the Aerostar and Chrysler minivans, the Lumina APV was configured with a single sliding door and a rear liftgate. Closely matching the 1987-1990 Chrysler "Grand" minivans in length, width, and height, the Lumina APV is nearly lower than the Astro and narrower. For 1993, the Lumina APV (and its counterparts) introduced a power-operated sliding door, the first American-market minivan to offer the design. Coinciding with the use of a galvanized steel spaceframe (in place of a conventional unit-body design), the Lumina APV was fitted with composite plastic (SMC) body panels. Developed for the Pontiac Fiero and later expanded in use for the Saturn SL, the manufacturing technique largely eliminated the threat of corrosion and damage from minor dents and dings. The manufacturing also allowed GM to style the Lumina APV separately from its Pontiac and Oldsmobile counterparts at low cost; each model line is externally distinguished by its hood and front fascia. Along from its front fascia, the Lumina APV is distinguished from its Pontiac and Oldsmobile counterparts in the styling of its roof. From the B-pillar to the windshield, the roof was painted black; on examples with tinted glass, the design was to retain the style of the glass roof of the 1986 Trans Sport concept. The Trans Sport had its entire roof painted black (with the exception of a band joining the B-pillars) while the Silhouette had body-color A-pillars and black B-pillars. Two-tone versions of the Lumina APV were available; an early configuration featured a blacked-out upper body. For 1992, Chevrolet standardized the folding sideview mirrors of the CL trim. For the 1994 model year, the Lumina APV underwent an exterior revision, shortening the front overhang by nearly three inches.