Hi All,
One of the greatest challenges we face in the love of these cars is that they made several changes over the '54 to '62 era. Another that compounds the problems is that different parts and assemblies went into the Canadian built and export models. In the Fab 50's Ford Club we have lots of these cars both U.S. and Canadian built and often finding two alike is a challenge. Part of it is the age of the cars and what may have been installed in them by prior owners.
What we've found works is to lay out what you've got and compare it to the other parts or parts you want to install. You can't always do that so that's what makes this community so important when you're seeking answers.
In Canada we used the '53 chassis under our '54 Fords with the Flathead for power so I can't tell you that a '54 box is ok for a '55.
For the '56 Ford, most we're 3-tooth sector shaft to fit the dish wheel. Early '56 got the 2-tooth sector but with the correct length shaft for the dished wheel.
'57 & early '58 worm & sector 3-tooth same as late '56.
'58 was recirculating ball as was '59, but '59 box was noticeably thinner or flatter to allow increased manifold clearance for FE 332-352 and you should always use the '59 pitman arm on the '59 box.
'55 through early '58 route the horn wire through the hollow steering shaft. '58 & '59 use a solid shaft and route it along side the column in an encased tube.
I have put the '59 box into a '56 along with the 352 V8, but it was with an afermarket wheel with the horn button under the dash and a Fenton 300 floor shift controlling the transmission.
To do it today, I'd swap the column cover and the box over as an asembly. The wiring for the horn and signals will be a bit different but nothing that difficult to figure out.
Additional info. steering box shaft on a '56 Merc is longer than a Ford it may be longer on the later Merc and Edsels as well.
Larry D
Winnipeg, MB Canada Eh!
'57 Fairlane 500 Club Victoria
'58 Custom 300 Tudor
'56 Crown Victoria
'61 Starliner Z Code
'51 Ford Victoria