I have a sm420 in my 62 swb. It is identical to the one in the pic, including the parking brake assy. Mine has a 2 piece drivshaft with no slip yoke. I believe that will be your issue. You may need to swap in a 2 piece shaft to run this trans. It is an extremely strong trans, but the ratios are terrible for me. I have a 3.90 rear end, and my motor winds out to the moon on the highway. I think you would be better off using a t-5 if your motor is a 6cyl. I did swap a saginaw into my '63 years ago in place of the full syncro 3 speed, for a dramatic gain in acceleration, but this was before o.d.'s were common. I'm gonna run a t-5 in mine.
