If you can find old TRW, its good. TRW is one of many that was bought out. Just a name. Goes with federal mogrol, sealed power, all owned by the same company. Sealed power piston are not even US made anymore. I install about $70K in Moog parts a year. The new ball joints without the boot look goofy , but never had a come back for a properly maintained ie "greased" regularly Moog part.
1969 x-77 Z/28 orange/ white stripes, named by my daughter "Clementine ", M-22 close ratio, 4:10 12 bolt, CE 302. Hugger orange with white stripes. White standard interior. Restoration complete May 2018