Anything is possible. My
91 sub has rear wheel anti lock brakes. there are several main parts to it....speed sensor on transfer case, ecu, control valve, etc.....
Best thing would be to get a donor vehicle (parts froom a slavage yard). Ensure your tranny/transfer case will accept a speed sensor. I have never done a changeover to abs, but i am sure it is possible.
GM used the Kelsey-Hayes RWAL rear wheel anitlock braking system, i think beginning in 1990 (or close to that year).





SgtDel
aka "Andy"
www.delbridge.net
1979 Big 10 383 stroker
1991 Blu 'Burb 3/4 ton 4x4