The Lexus RX first premiered in 1997 as a Lexus concept, followed by the debut of the production RX 300 model at the 1998 North American International Auto Show. In 2003, the second generation RX debuted in the U.S., and the redesigned RX 330 went on sale shortly after. Equivalent versions of the first and second generation models were sold in Japan under the Toyota Harrier nameplate until 2008. In 2006, the RX line added the world's first luxury hybrid, the RX 400h. The redesigned third generation RX 350 went on sale in early 2009, followed later that year by the second generation Lexus RX hybrid, the RX 450h.
In 2006 for the 2007 model year, the RX received a mid-cycle refresh consisting of a new 3.5-liter 2GR-FE V6 replacing the 3.3-liter 3MZ-FE V6 engine on non-hybrid models, updating the vehicle's name from RX 330 to RX 350, with new model codes GSU30 and GSU35. In 2007 for the 2008 model year, the RX received a revised grille, chrome door handles, available new seven-spoke 18-inch alloy wheels, and new exterior choices.
At the 2007 Tokyo Auto Show, the LF-Xh concept was unveiled, hinting at the styling direction of the next RX. Later in November 2008, the redesigned third generation RX premiered at the Greater Los Angeles Auto Show, appearing as the standard RX 350 (GGL10/GGL15) and hybrid RX 450h (GYL10/GYL15). The Japanese market Toyota Harrier was discontinued, with previous generation sales held for several months following the third generation's debut.
The redesigned RX 350 features a revised 3.5-liter 2GR-FE V6 engine producing 275 horsepower (205 kW) with a wider power curve, it remains ULEV-II certified and now uses a six-speed automatic transmission with sequential shift. A double wishbone rear suspension setup replaces the previous MacPherson strut design for improved handling and greater cargo space, while an optional Sports Package adds a performance-tuned suspension. Both non-hybrid and hybrid models continue in either front or all-wheel drive configurations, with the all-wheel drive system gaining Active Torque Control for greater efficiency, and all models are built off the new midsize flexible K-platform. American RX 350 sales began in February 2009 as a 2010 model.
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