For a Galaxie, it is not only a long tail-housing, it is a specific output shaft and housing. The galaxie also has the shifter in a different location, and also the speedo gear is on the opposite side, and uses a specific gear that is (backwards rotation) compared to most others. The tail-housing is easily identifiable... has a weird dip or valley in the top up toward the main case. If you do some research you will see what I mean. David Kee's Toploader website has a ton of info that will help you. You can convert your toploader easy enough, by buying the correct output shaft and tail-housing... and swap it over.