Patrick's site isn't too specific as to what vehicle applications the Saginaw would come from, only that it's an iron case, 3.11:1 first gear, and has 2 id grooves on the input shaft. That transmission only gets you better gear spacing, it does not have an overdrive, so top end will be the same.
The 3.38 ratio mentioned is for the '55-'62 trucks, it's not compatible with the torque tube.
