Generally-speaking, early transmissions started off with cast-iron casings before switching over to aluminum or magnesium to save weight. The Next Generation: XTrac P1334 5-Speed Sequential Manual ...

The TH400 and NP203/NP205 doubler combination had served me well, but the 1-ton non-overdrive transmission combined with two iron transfer cases was weighing in on the high side of heavyweights.

Eaton’s heavy-duty 4-speed electrified vehicle (EV) transmission has been recognized as a 2024 Automotive News PACEpilot Innovation to Watch.