I was driving my blazer home from the alignment shop last week, when all of a sudden my rear driveshaft dropped. The rear yoke busted off the Differential. Well it happened to be on a steep hill and the pinion gear slid into differential causing the whole thing to lock. I got it towed home and opened it up and the locker had been all chewed up. i haven't been able to get a good look but anyways the piont is i need to either rebuild it or get a new rear axle. The busted axle is a stock 12 bolt on a '79. My question is whether i should put any money into fixing it or just get a new one or a junk yard one. If i do go with one from a junk yard are there any other axles from different years i should keep my eyes open for the will be a direct bolt up?? I also have 33 inch tires and wanted to rear gear at some point but i don't have alot of money. Any help witht his problem would be greatly appreciated.