Most racing sanctioning bodies like the NHRA and NMRA require 1979-93 Mustang racers to install a driveshaft safety loop. Keep your 1979-93 Mustang driveshaft in place with a drive shaft safety loop. They bolt directly to the bottom of your car just behind the transmission and are designed to protect your fox body Mustang’s underside and you from the dangers of a broken driveshaft.