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SGBARRACUDA said

The difference is in the spline count on the input. 19 on the early models 24 on the later.Changed in 67. This is on BB. SB used a smaller convertor register on the early models. I think 66 or 67 was the split

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I think on SB 727s also, in Canada at least, with 67 the first year of the 24? I only ever built but one 66.