This 1987 Buick Grand National GNX is #481 of 547 produced for a single model year and shows just under 500 miles. The car was sold new at Sendell Motors in Greensburg, Pennsylvania, and was acquired by the selling dealer from a collector earlier this year. Power is from a turbocharged 3.8-liter V6 mated to a 4-speed automatic transmission, and the body is finished in black over a two-tone cloth interior which retains protective plastic coverings. This GNX is offered with factory literature, GNX memorabilia, an ASC/McLaren window sticker, a clean Carfax report, and is offered with a clean New Hampshire title.

The GNX was built in partnership with ASC/McLaren and featured an upgraded powertrain, suspension, and instrumentation over that of the standard Grand National. The black finish on this example has undergone paint correction and detailing according to the selling dealer, who notes fading on its uncracked bumper filler panels as well as an inoperative power antenna.

The fenders were equipped from the factory with vents instead of Grand National emblems, and GNX badging is limited to the front grille and trunk. Black 16″ mesh wheels feature polished lips and are mounted with Goodyear Eagle VR50 tires.

The interior is trimmed in black and grey cloth with embroidered logos on the headrests, and protective plastic is affixed to the front seats, steering wheel, and carpeting. A plaque mounted to the passenger side of the dashboard shows that this is #481 of 547 GNX models produced.

Analog instrumentation from Stewart-Warner consists of a speedometer, tachometer, boost gauge, and 5-digit odometer showing 459 miles. Additional features include power windows and locks, a power driver’s seat, and a GM-Delco AM/FM cassette stereo.

The GNX featured a 3.8-liter V6 that was upgraded by ASC/McLaren with a Garrett T3 turbocharger, a larger intercooler, and a low-restriction exhaust system for significant power gains over the standard Grand National. Power is sent to the rear wheels through a 200R4 4-speed transmission which was reprogrammed and fitted with a different torque converter and larger oil cooler.

The GNX also received a Panhard bar mounted to a special differential cover on its limited-slip differential. Additional photos of the undercarriage are included in the gallery below.

Factory literature, service records, and GNX memorabilia are included in the sale along with a window sticker listing the modifications by ASC/McLaren and an MSRP of $29,290.

The accident-free Carfax report shows ownership history in New York, Pennsylvania, and New Hampshire from 2013 to 2019.