DRUM 205L, DURADRIVE HD TES-668
DURADRIVE™ HD SYNTHETIC 668 is the global factory fill automatic transmission fluid for Allison Transmissions and is TES-668™ approved.
DURADRIVE HD SYNTHETIC 668 is fully backwards compatible for every Allison transmission that requires an approved TES-295® fluid. If you want your Allison transmission to perform the way Allison built it to perform, and to last the way Allison built it to last, you don’t change the factory components. And that includes the ATF.