Do I need to change power steering box for disc conversion

[Scottcoda]

It has been sometime since I started to get all the parts together for my c20 brake conversion but I am in the final stretch... I have a Lares quick ratio steering box that I installed when I did the power steering upgrade last year, I am doing an A-arm swap (leaving stock crossmember) the donor truck is an 87 Chevy suburban 2wd 3/4 ton, Will I need to change the power steering box, if so what box?, Thanks for any input