ECE 4/6" drop kit work with ford 9"?

[Ghost's68]

Hello everyone,

After picking up my new truck I'm looking into actually getting a drop kit installed. Right now I'm riding around on cut springs and as many of you know, the rides rough. Lol I was looking at picking up the ECE 4/6" drop kit but wondering if there would be an issue with it since I have a ford 9" rear end. All work was done by previous owner. Thanks in advance guys.

PS- I searched but couldn't come up with anything related.