[DryStout]

I thought this was an intriguing quote from the following link. See below.

http://www.maximum-cars.com/Cars/Car.php?carnumber=624


[Working on a clean sheet of paper, Mustang’s engineering team could have selected any type of setup at the rear, including an independent suspension. So why choose a solid rear axle? The answer lies in Mustang’s position as America’s muscle car.

"We talked to a lot of Mustang owners and racers when we were developing this program," says Thai-Tang. "They are a very passionate group, and a lot of them told us – very strongly – that the all-new Mustang must have a solid rear axle because of its combination of performance and modification flexibility." ]

Who would have thought a solid rear would be chosen over an IRS.