Hello Ed, I installed a mannual trans in a Dynaflush '56 Special in 1985. I took the transmission down to a local machine shop so he could measure the input shaft. I provided him with the I.D. of the end of the Dynaflush crank. He made me a bushing for about $40. I "tapped" it in and put it toghether(my first trans. swap job). I put around 75000 on the bushing with no problems. Hope this helps, Glenn