The SUV is built on a truck platform, with all models having four-wheel drive as an option with both automatic engagement and the more traditional "4 High" and "4 Low" gearings. The vehicle has enough ground clearance to allow certain off-road usage. Its main disadvantage is its increased width (as compared to a Suzuki Samurai or a Jeep Wrangler) and lack of suspension travel, causing it to high side when it encounters high-camber-variance terrain or large rocks. Additionally, it lacks either locking hubs or a limited slip differential, though the latter is available as an option.
2002- LL8 4.2 L (256 in³) I6
2003- LM4 5.3 L (323 in³) V8
One unique element of the TrailBlazer line was the availability of a 3-row 7-passenger EXT version. This vehicle is 16 in (406 mm) longer and has a higher roofline to allow easier access to the third row of seats. This roof is disguised by standard roof racks.
Production of the EXT model was handled by the Oklahoma City Assembly plant in Oklahoma City, Oklahoma. The last TrailBlazer EXT rolled off the assembly line on February 20, 2006, because GM had reportedly closed that plant, making 2006 the final year for the TrailBlazer EXT.
An SS model was introduced for 2006 with the Chevrolet Corvette's LS2 V8. This new Trailblazer is equipped with a 6.0 L LS2 V8 with 395 hp and 400 ft·lb of torque. It can accelerate from 0 to 60 mph in 5.8 sec (est), and can do the quarter mile in about 13.5 sec. at 100.0 mph (est).