I purchased an under the floor power brake system from Pirate Jacks and it bolts right to the left side frame of my 46 1/2 ton.The fronts are disk and the backs are drums so you might have to get a system specific for your application, (drum, drum or disk drum). There prices are very competitive and sell all the popular makes. I saved quite a few bucks as up here in Canada rod shops are far and few and charge you whatever they want. Hope this helps and good luck.
Bob T
