More likely as in the case of our 300D, a previous owner replaced the "straight" rear with a limited slip rear for racing. He left the straight axles in. After about 40,000 miles, the axles will wipe the splines right off the end. You have about 1 second warning and <POW>. If you're very, very lucky, Ray Jones will decide that very minute to come visit you (in his L) and help you push the beast the two blocks home. Checking the axle play on a car that makes no noise and indicates nothing wrong on a used car is not something one does. And checking axle length is tough!!!! I suppose the easiest thing to do is to check the microfilm for your 300 to find out what kind of rear came in it. Then jack your car up and see if the rear in the car matches. Gloria Moon