I went 4 bying this weekend in my 83 k5 2500. The blazer was doing great all morning. The last hill was 200 yards up about 150 yards up my differential broke. The tires came off had 2 get a tow truck, To get me out. I don't know why this happened. Does anyone have an idea and what should I go with next? I'd appreciate any help. Thanks in advance. I dont have a lot of money. What would be my best bet so this doesn't happen again. Paid an $800 dollar tow.