One problem related to transmission not engage has been reported for the 2008 Ford Mustang. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2008 Ford Mustang based on all problems reported for the 2008 Mustang.
Since car was purchased new, manuel transmission was very difficult to shift from 2-3 gear (especially when cold). Sometimes gears would grind, or would not engage at all. Shifts would often take about 2-3 seconds to engage, with car losing speed during this time. At 5800 miles, transmission required the synchronizers to be replaced under warranty. Currently car has 22,000 miles. At times, gears would not engage smoothly from 2-3 shift (when transmission hot or cold), and requires 2-3 seconds for gears to engage. This occurs occasionally, without any forewarning.