Ah, the golden age of American muscle and robust engineering! If you’ve spent any time under the hood of a classic General Motors vehicle from the swinging ’60s, chances are you’ve encountered two legendary names: the TH350 and the TH400 transmissions.

While they might share a manufacturer and a memorable era, and their names only differ by a few digits, don’t let that fool you into thinking they’re cut from the same cloth. Beneath the surface, these automatic powerhouses boast distinct characteristics that set them apart. We’re talking about more than just numbers here – there are crucial differences in design, application, and pure brute strength that make each one a legend in its own right.

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