While driving at 55 mph on a flat, straight, no traffic, early morning, clear day, new road, between key largo, Florida and homestead, Florida, my 2008 GMC quadcab diesel with 40,000 miles began vibrating violently. After about 4-5 seconds of tremendous vibration and deceleration, at approx. 35 mph, there was a loud bang. The vehicle was stopped safely on the paved shoulder. After examination on a flat bed tow truck, it was discovered that the "U" joint broke connecting the driveshaft and transmission. The free-wheeling driveshaft punctured three holes in the front floor of the cab, crushed the catalytic converter, smashed the anti lock brake module, broke the gearshift cable, and bent the driveshaft. A steel chasis cross member prevented the driveshaft from dropping to the pavement thus preventing a possible vehicle end over end rotation. The vehicle has a 100,000 mile power train warranty. Today, 3-21-11, 21 days after the incident, no repair has begun on the vehicle. Only three days of rental car was provided. Why has it taken so long to authorize the continuation of a rental car and the GM 100,000 mile power train warranty repair? apparently, a GM representative outside of the dealership of homestead Chevrolet Cadillac in homestead, Florida must authorize the warranty repair because the damage exceeds $3000. They would also cover the cost of a rental car. The vehicle owner has documented proof of completing all the required service and safety checks from exclusively GMC dealerships in Florida and Georgia. Please help to resolve this issue as soon as possible. Please advise General Motors (GM) that the 100,000 mile power train warranty is certainly applicable to cover the entire vehicle damage repair and cover a rental car for the duration of the repair.

- Key Largo, FL, USA