I am a huge fan of the fast hitch! Implements are a bit harder to find, but it is sure nice to be able to drop a plow and pick up a disk in a matter of minutes.... including the time to move the 'stinger' (pull bar).
Right now I am in the middle of installing a sandblasted and painted one on my 77 Cub. Even though I took it apart (2 years now
) and am very careful, there is an amazing array of parts to them and easy to misplace some along the way. When you go shopping you really need to make sure that all the parts are there. Very often the helper spring is left on the donor tractor as it is not obviously part of the fast hitch. There is also huge and incompatible differences with one for a Lo Boy. Recently a guy had one on eBay and refused to change the listing to indicate Lo Boy after I told him.
It is listed in the Cub parts manual and the pages around this one may be helpful:http://farmallcub.info/tc37f_db/tc37f_d ... 009-05.jpg