Jeep Wrangler JK is a 4-door off-road SUV manufactured by Jeep. It was introduced in 2006 and succeeded the previous model, the TJ. It is a two-door compact SUV with an SUV body-on-frame chassis, a separate body and frame, and a standard four-wheel drive system. It is powered by a 3.8-liter V6 engine. It can come with either a six-speed manual or five-speed automatic transmission. The Jeep Wrangler JK has been available as a two-door or four-door model, with a variety of trim levels.