1985-1991: This was the first generation of the N-body Grand Am. It was available in Base and LE models. There were many engine options including: The 2.3L 4 cylinder (150 hp), 2.3L quad4 (180 hp), 2.5L "Iron Duke" 4 cylinder, 2.0L 4 cylinder turbo(1987-1989) (165 hp), and the 3.0L v6 (1985-1989).
1992-1995: This was the second Generation N-body Grand Am. The trim levels available were SE for the base model and the GT for the upgraded model. A 2.3L Quad4 High Output motor as well as a regular 2.3L were avaiable. The v6 engine changed from a 3300 to a 3100 in 1994.
1996-1998: This was a redesigned version of the second Generation n-body Grand Am. They updated the body panels and interior. The 2.4L engine was available in the base SE model as well as in the GT model, but the GT had an available 5 speed manual transmission. The 3100 remained available through the duration of this generation.
1999: This was the first year of the last (fourth) generation of the N-body. It was built on a new version of the N-body platform. They made the new cars wider, increased the enigne power ratings, and refined the interiors with better fit and finish. The new redesigned grand am had a base model 2.4L DOHC motor with an optional 3400SFI v6. The 2.4L had 150hp/150tq while the base 3400 had 170hp/205tq. The stepped up GT model came with a 3400 high output, with 175hp/205tq. The trim levels available were: SE, SE1, SE2, GT, GT1.
2000: The only changes for 2000 were that the GT engine was called 3400 Ram Air, and the fuel injectors were changed from AC Delco to bosche in the 3400. They also added a 5 speed transmission for the 2.4L engine. The trim levels available were: SE, SE1, SE2, GT, GT1.
2001: The radio changed from 1.5 DIN to 2 DIN, Monsoon was added as a stereo upgrade, and the 15" alloy wheels changed designs. The trim levels available were: SE, SE1, GT, GT1.
2002: The base model engine changed to a 2.2L ecotech and the center console was slightly changed to integrate the cup holder rather than using a separate plastic piece. The trim levels available were: SE, SE1, GT, GT1.
2003: The SC/T perforamnce package was added to include the ram air hood, spoiler, and stainless steel exhaust tips. The side mirrors were changed from the dual post to the Alero style mirrors. Traction control was made optional (rather than standard feature). The trim levels available were: SE, SE1, SE2, GT, GT1, SCT.
2004: The side ribs were removed from the SE model (because the Alero was discontinued), and the coupe was only available as a GT. The trim levels available were: SE, SE1, SE2, GT, GT1, SCT.
2005: This was the last year the Grand Am was available. The G6 replaced the Grand am, and is on the Epsilon platform. The SE only went to fleets, while only GTs were available to the public. The trim levels available were: SE, GT, GT1.
The final grand am rolled off the assembly line on May 6, 2005 in the Lansing, Michigan plant.