This is what I did 8 years ago when I put an 80 Blazer axle in my 51 crude,but has worked with no problems. I cut off the cable ends,pulled the cable back out of the sheath,then cut the sheath to length.Pushed the cable back in and used a cable hardware store cable clamp to attach the Blazer cable to the original cable adjuster.
[img]http://img.villagephotos.com/p/2003-1/95040/EQUUE-brake.jpg[/img]