Special high-strength and heat-treated materials are used in the 4L70 to ensure it delivers smooth, dependable shifting.

A performance-oriented all-wheel drive system is available, giving the TrailBlazer SS impressive on-road grip and enhanced "launch" feel. The always-engaged system uses a Torsen center differential to split torque between the front and rear wheels. It is a torque-bias system that detects low traction at one axle and directs more torque to the other when needed - it is capable of changing the normal 67-percent rear-axle torque bias up to 45/55 (front/rear) or 25/75 (front/rear), depending on the road conditions.

As with all Chevy models wearing the SS badge, the promise of 2007 Chevy TrailBlazer SS's performance specifications is reinforced by authentic design cues. For this midsize SUV, that means a tight, sleek look and a monochromatic color scheme, with sporty front and rear fascias, a racing-style black mesh grille and large, bright exhaust outlet exiting beneath the rear bumper. 2007 Chevy TrailBlazer SS also has been stripped of body side moldings, the roof rack and other cladding that adds visual weight to the vehicle. The rear pillars are blacked-out, blending with the tinted glass for a more integrated, wraparound style. The mirrors, door handles and grille cross bar are painted body color, too. Four exterior colors are available: black, white, silver and blue.

Inside, a driver-oriented "cockpit" features a SS-signature instrument cluster, including a prominent tachometer. The silver-face tachometer has black numerals, a signature SS item. Other SS-specific cues include embroidered seat backs and the leather-wrapped steering wheel. Performance-style front bucket seats are standard and feature firm "wing" bolsters to help keep the driver and front passenger planted during spirited driving. Cloth seating is standard and leather-appointed seating is available. And because SS means style as much as performance, the TrailBlazer SS's refinements include a French seam stitching on the console armrests, aluminum sill plates and numerous chrome accents. A T-shape shifter with a satin nickel accent also distinguishes the vehicle's cabin.

2007 TrailBlazer SS also delivers the capability expected of an SUV: The towing capacity is up to 6,700 pounds with the two-wheel drive model and up to 6,500 pounds with the available all-wheel drive model.

*Horsepower and torque SAE certified. A new voluntary power and torque certification procedure developed by the SAE Engine Test Code committee was approved March 31, 2005 . This procedure (J2723) ensures fair, accurate ratings for horsepower and torque by allowing manufacturers to certify their engines through third-party witness testing. GM was the first auto manufacturer to begin using the procedure and expects to use it for all newly rated engines in the future.

**Preliminary, pending SAE certification.

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