If your diff cross pins aren't broken take a look at where they are machined for the other pin to fit. I just built a new 8ight 1.0 buggy and all the crosspins were machined wrong allowing the spider gears to bind up inside the diff cases. I had to call losi and get them to send out new ones and I'm praying the new ones will be right. I've built 5 losi buggies and never seen this before. If yours is doing the same thing that could explain the center diff blowing because one side will bind and cause a failure. What happens is the spider gears will lift up on one side and bind against the outdrive, causing it to tear up stuff.