This leak is common, it comes from a plug on the bottom front that doesnt quite seal right. You can get a viton o-ring that will fix the issue, or you can call steve at Tousley Ford and he will hook you up with a contour housing. Its about $50 but it replaces the whole housing and fixes the problem.
Link for your reference:
Fixed the coolant leak today, pics
They're Viton -203 Viton O-Ring, 75A Durometer, Black, 5/16" ID, 9/16" OD, 1/8" Width.