HOW MUCH IS THE AUTOMATIC TRANSMISSION'S REPLACEMENT COST?

Hello, a flex plate breaking is definitely not a common occurrence and sure, could be due to exceeding the load capacity of the vehicle. Still, I haven't seen this personally. In any case, you will need to get "real world" estimates from local shops near you. Here are some to contact: http://repairpal.com/ford-within-10-miles-of-el-centro-california-92243