What is the best steel shaft to replace a Reax 85-88 gram shaft?
Which Reax shaft do you have? What flex?
I would look at the new KBS Max 80 steel shaft. Once cut for installation it will be in that 85 to 88 gram range and will match the playing characteristics of the REAX shaft.
https://www.golfworks.com/kbs-max-80-iron-shaft/p/FS0052/