The case involved a 22-year-old Texas woman who was left partially paralyzed when a Firestone ATX on her 1999 Mazda Navajo failed and the vehicle rolled over.
Bridgestone/Firestone North American Tire previously paid an undisclosed settlement in the case. The jury found Ford 75% liable, Mazda North America, which marketed the Ford Explorer variation, 10% liable and BFNAT 15% liable.
The tire was allegedly a spare that had been installed on the vehicle. The accident occurred in 2002.
Ford said it planned to appeal the verdict.