because they are torque to yield meaning can only be used once then they are no good and need replacement but just use them again if you want, but at least get the rest of the parts and the chains do sag if they are old even with the tensioners but its your car im just saying what good is your nice stang with all those mods in it if down the road the **** breaks down and then you will have to spend even more to fix it when that money can go to getting some more mods or some thing else you would like but to each his own