1955 Chevy 3100 1st series 5 window

[dumbfarmboy]

It will not bolt up to the 4 speed. You will need to get a new bell housing if it orginally had the three speed. I did the same thing on my pickup, and was unpleasantly surprised when I tried to bolt them up. One of the many lessons I learned. Also you will have to modify the length on the clutch throw, no big deal but it took me an afternoon to figure it all out.