Thanks for your thoughts guys.
I chose to go with the TCI kit because they're 100% made in the USA, and I've had some really good recommendations from others who had it. I drive the truck alot, but I'm not hauling anything.
There are actually no Mustang parts in my setup. I went with the TCI tublar A-Arms, GM spindles, and an after-market rack. I love the ride, handling, and brakes, but I hope I didn't make a mistake. I'm waiting for my free replacement ball joints. When they arrive I'll try to see exactly what kind of ball joints they are and what kind of load they're rated for.
I'm glad TCI is standing behind their products, and I'm glad to hear others haven't had the same issue.