Swapping 1964 plymouth Vailant from automatic to 4 speed

bcschief said

Be aware that Dart and Valiant are 2 different wheelbases so the Dart driveshaft is longer than a Valiant.

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That will depend on the years and models involved, and how they're equipped. It has to do with the length. A '66 Dart S.W. for instance uses the same driveshaft as some '66 Valiants/Barracudas. It's just a matter of length.