GM's are 10spline (manuals), 27spline(TH350), or 32spline(TH400). Fords are 31 spline. Dodges are 23 spline. The Dodge case is the same as the Chevy case. Only the input gear (and therefore spline count) is different. Fords have a different case than the GM/Dodge.
the physical case body and internals are the same as a GM NP203, the only difference being the input gear. If you have a very hard time finding a dodge box you can get a GM box and purchase the input gear on the aftermarket. We generally sell an input gear of this type for ~149.
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