2009 Mustang Engine and Drive-train: Evolution. The new 3-valve 4.6 liter V8 will likely soldier on as the standard 2009 Mustang GT power plant. It has already proven to be a winner both on the track and on the street. What is sure to be new for Mustang is displacement-on-demand (DOD) technology that will shut down 4 of the 8 cylinders while coasting or cruising at speed. When you step on the gas, the computer will provide seamless power delivery when the full cylinder count comes back on line. Because of the added efficiency afforded by DOD, a more aggressive tune will be feasible offering up to perhaps 325-340 hp. The 4-valve version of the 4.6 and 5.4 are also likely to return in either supercharged or naturally aspirated forms for higher performance models. A 3-valve 5.4 liter V8 is also a possibility as it is less costly than a supercharged engine with similar power. For the base power plant in the 2009 Mustang we believe the new 3.5 liter DOHC V6 built in Ohio should replace the decades-old German built 4.0 liter truck engine that the current car uses. The new 24-valve power plant offers more standard power at around 250-260 and is a far more refined and happy revving engine for the Mustang. Will a six speed transmission ever become standard in the 2009 Mustang? Perhaps, but it is more likely to be a six-speed automatic that is available at first. Unless the competition warrants otherwise, our bet is on the 5-speed manual to stick around except on hi performance models like the Cobra. A true manu-matic sequential gearbox with shift paddles on the wheel is an expensive proposition that might be in the cards for the upper line Cobras, but we aren’t holding our breath. 2009 Mustang Chassis: The “DEW-lite” chassis the 2005+ Mustang rides on was a significant investment for Ford even though it was derived from the existing floor pan that carried the Lincoln LS, Thunderbird, and Jaguar S-Type. Significant changes had to be made to lighten up both the weight and cost to fit within the Mustang’s needs. We see an evolution of the current chassis to continue under the new Mustang but with a few key changes. An independent rear suspension (IRS) was initially planned for the 2005 Mustang but notably missing when it arrived on the showroom floors. Why? It costs too much. While Ford has said that customers “don’t want it”, and that “it is not necessary, blah, blah”, they are well aware that the competition from GM and Chrysler are going to have it. They are aware that customers want it and that it’s a necessity to win over import buyers that would otherwise shop for a Nissan 350Z or other comparable sports cars. Thus, the next Mustang will have IRS if it is to be taken seriously among its peers both stateside and from abroad. 
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