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2004 Ford Mustang Deluxe 2dr Coupe

2004 Ford Mustang
Trim Info:
Rear Wheel Drive, 2 Door Coupe, Subcompact
20 mpg city / 29 mpg hwy
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September 19, 2013, 5:11 pm

Joseph P

Question: how do i tell if i need u-joints or a rear end?

My mustang shudders violently and briefly at certain speeds, it also makes a loud screaming noise when in motion...but only after it has warmed up or it is hot outside. The differential was bone dry when i checked it but there are no leaks. I filled it and it still does the same thing.

October 1, 2013, 11:05 pm

Richard W
Expert Mechanic

I would start with the u-joints. They could be dry. Most of the time you put the car in neutral. Set the parking brake. Block the wheels. Get under it and try to twist the drive shaft. Look for any play between the drive shaft and the yoke. If you have any you need u-joints. Or it could be locked. The you have to remove the drive shaft and try to move them. If they feel stiff at all you need to replace them.

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