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you need a th400 with super short 203 style 32 spline output shaft (or swap shafts from another tranny) Then you need an 32 spline input gear for the 203. Then you need an adapter for the 400 to the 203. I would find a rare th400/np203 combo stock from a 78 or 79 3/4 or a full time one ton usually found in gmc's over the chevys. Plus all the above mentioned. Have those custom driveshafts re-customized to proper length (longer front, shorter rear)
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