Hi. I'm putting power steering in my 1970 highboy. I just took a 2wd box out of one of my donor trucks that burned in the forest fire we had here a few years ago. I think the donor is a 71 or 72. I can't tell too good because it's pretty burned. The steering box looks untouched by the fire. The tag number on it is "EDSPAL" with a 9D 1C below that. The S in the number was hard to read but sure looks like an S.
I have another one I got to do this job and it's tag number is "SPA BS" with H 22 below that.
I think during my search for the numbers I found the SPA BS is 74 to 78 2wd F150 -350
Thanks for any input. Tips. Opinions.

 

Bill. Are you there? Sure could use your expertise.

 

As far as I know you can't use a 4x2 box on a 4x4 Highboy. 4X4's box mounted up front while 4x2 mounted back closer to firewall.

 

Thanks Jeff. I've been using TigerDans links provided at the beginning of the 67 to72 forum. https://www.ford-trucks.com/forums/8...-articles.html
It seems there are a few different boxes used for this project.