I have a 1975 CJ5 and when I bought it, it came with a 350 and a TH 400 installed. I then decided to Stroke the engine and made it a 383. The only adapter that I saw was from the TH 400 to the Dana 300 Transfer. My mecanic told me that the shaft on the tranny was longer also. Hopefully this helps or maybe someone can correct me if I'm wrong.