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In the Mustang world, we have many transmission choices. When the '05 Mustang was introduced, a five-speed automatic transmission came with it. Thanks to Performance Automatic's [(301) 963-8078; www.performanceautomatic.com] Pro Fit bellhousing system, Fox owners can slide one of these transmissions in the tunnel and connect it to a hallowed 5.0 pushrod engine. The gearing in the 5R55S is close, and you don't lose rpm like with an AOD. We haven't experienced or tried this swap as of yet, but we bet it would be a blast.