First off, I do not have that period MPC.
But this question has me wondering also. The 1957 FORD Shop Manual makes no distinction (if there is any) between the two boxes (if there are two boxes). Now the 1958 MERC Shop Manual does.
The manual steering gear is similiar to the power steering gear, but is of heavier capacity, has a different ratio, and incorporates needle bearings on the sector shaft. The gear used is of the ball and rack type. Standard steering has 60 recirculating balls, and power steering has 54 recirculating balls.
Now the 57 FORD used a worm and gear box and was upgraded to recirculating ball in 1958, making steering effort easier and making the actaul box smaller in size, so the 58/59 retro-fit is desirable.
I am going to refer you to a 57 FORD site and also a Y-BLOCK site. They are much more knowledgeable on this than I am. There is also discussion of 60/64 box upgrades, Saginaw upgrades and rack upgrades. The trouble is, they never seem to go into enough detail to draw any type of conclusion from it.
When you find the answer, please post it here so that the rest us may learn also.
-1957 FORD International-
-Y-BLOCK Discussion Group-
I am looking for information concerning factory performance/aftermarket speed parts (1958/1960) used on the MEL (Mercury-Edsel-Lincoln) (Also Thunderbird 59/60) Engine Series (383-410-430-462) produced from 1958 thru 1968.
Also older FORD Special Service Tools
-MEL Engine Forum-