Differential Unit problems of the 1998 GMC C1500

1998 extended cab GMC sierra 1/2 ton. Rear differential exploded at 60,000 miles. Transmission was rebuilt and now it is acting up again at 80,000 miles. This truck has never been driven by anyone other than myself. This truck has never been abused and I followed the maintenance suggestions in the book. Is there some problem with this make/model. I have always owned GMC products and never had any trouble like this.

Witnessed carl black dealership cover-up safety problems too myself and many customers in my many hours in thier dealership (they routinely call safety problems as "normal "to their customers this includes problems with brakes and steering. Their customers should be notified that their problems where not "normal".