727 poly engine transmission

The 66' alignment pins on mine are in the same locations as the newer 67', just as the driveshafts interchange as well. 66's transitioned to tail splines, and also relocated the dowel pin location. They were on the same assembly line with the newer models. Now, my 727 64' push button torqueflite did hooked up to my A Motor 56', because those dowel pins are the same. That is true.