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Disclaimer - Driveshaft Hardware
The 1979-2004 Mustang factory driveshaft bolts are installed using a thread locker chemical and are NOT torque to yield. If reusing the factory bolts, clean the old thread locker material from the threads, and apply new blue thread locker before reinstalling the bolts or use new driveshaft bolts and apply blue thread locker to threads and torque to the factory specifications. New bolts can be found here: HDW-4602.
For 2005-2021 Ford Mustangs, it is recommended that you install new driveshaft to pinion flange bolts when removing the driveshaft. The driveshaft to pinion flange bolts are torque to yield and should be torqued to 41ft-lbs.