20005 GT transmission noise and power loss - Ford Mustang Forum
 
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post #1 of 3 (permalink) Old 11-07-2012 Thread Starter
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20005 GT transmission noise and power loss

There is a metallic grinding noise coming from my five-speed manual transmission. There is also a loss of power and a shuttering as I accelerate in first second third and fourth. My buddy owns a cobra and he thinks it is the differential gears. But the other two people I have asked think it's the clutch. The automotive guide I'm reading suggests that might be the u joint.

I got it up on jack stands last night to inspect the driveshaft. There wasn't really that much play in the driveshaft at the joints. I'm not really sure how it could be the pinion either since it seems like the whole differential would seize up.

What I don't understand is that the service records indicate the clutch was replaced one year ago at 105,000 miles. It has 125,000 miles now. Anyone have a similar problem? Any opinions would be greatly appreciated. Thanks in advance

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post #2 of 3 (permalink) Old 11-08-2012
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Your combination of symptoms is confusing.
- Shuddering - usually caused by contaminated clutch or flywheel. This can happen if they did not resurface the flywheel (clean all the old gunk off) when the clutch and pressure plate were replaced, or if driving technique caused clutch to get hot and transfer material to the flywheel.
- Loss of power (acceleration?) - usually due to clutch slipping

To check for slipping clutch:
- Find a long uphill highway, as steep as possible. At highway speed (about 45mph+) put the car in 4th and floor the accelerator. If your rpm rises proportionately faster than your road speed, the clutch is slipping.

You may also have a problem with the slave cylinder or linkage on the hydraulic clutch. If the clutch master or slave cylinder loses its seal, the clutch may not disengage completely when you press the pedal down. The master (on upper part of pedal) can be changed fairly easily, but the slave requires transmission removal.

Bruce

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post #3 of 3 (permalink) Old 11-08-2012 Thread Starter
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Thanks Bruce actually today my car started exhibiting new symptom. The grinding noise is now evident when my foot is all the way down on the clutch pedal. I think you're right it's probably the shift linkage
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