[55Brodie]

If you can find a Y-block Cruise O Matic (aka Green Dot) tranny from '58-60, the swap will be a slam dunk. In '61 the COM got a vacuum modulator so I'm not sure if your kick down linkage would be compatible. I'm running the COM in my '55 with a 3.00:1 9" rear and it's the best of both worlds. Good off the line and 2500 RPM at 75 MPH. Waaaaay better than my old 3 speed Fordo and 3:55's.