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If i remember right there are 2 different in-put shafts (that go into the converter) one is 27 splines and the other is 30 splines as in most V8's. I ran a 27 spline behind a 468 BB in my nomad with a non lock-up TCI converter. was not a race car by ant means. was nice on the freeway with 3.08 gears. so if you get a trans without a conv. ck spline count before ordering one.