Axle shaft and axle help

I currently bought a Posi unit out of a 98 explorer with 373 gears. It is setup for a 31 spline axle. I have a 97 cobra rearend That I would like to put these into. If I swap my axles from the 98 explorer as well as the posi unit am I still gonna be able to keep my cobra brake setup. And has anyone had abs in the rear and put in non abs axles. Did the abs light come on and if so how do you get it to go off.