07 Gt500...severe Slippage Under Moderate To Heavy Acceleration

COramprat

...I can take it. I think.
Dirt-Old 20+Year Member
Mar 2, 2003
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My dad's car...he noticed some over revving under moderate accel. I drove it today and in any gear, if you give it gas, the engine revs to about 3500-4000 RPM's then drops back and accelerates normal. Boost gauge around 3-4 lbs. Clutch disengaged...I didn't notice anything when engaging clutch and shift normally under light load.
 
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I've done that to many many clutches from different companies.


It's worn... Product of either longevity or spirited driving or both. 7 years out of a clutch in a Shelby? I'll take it. hehe
 
Regardless, your description is a worn clutch. People sometimes underestimate the impact of PD blower torque.

My Fox eats DFCF clutches with its morning coffee and Nitto donuts. :D
 
Maybe a bad slave? Left the bank and saw some fluid under the car but couldn't find any wetness where it had dripped. Assumed it was there before. Where is the reservoir for the clutch hydraulics?
 
We just had a c6 Vette in the shop, I had to change the Slave Cylinder. It's an 06 with 25k miles on it. Seems like somehow moisture gets in the system after time. Was kind of weird. Normally the reservoirs are located on the firewall near the BB and Master.
 

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Maybe a bad slave? Left the bank and saw some fluid under the car but couldn't find any wetness where it had dripped. Assumed it was there before. Where is the reservoir for the clutch hydraulics?


Generally, a bad slave in a hydraulic clutch system will:

Make the car difficult or impossible to put in gear while the motor is running
spew fluid all over the garage floor (you would still see evidence leaking from the bell housing)
cause grinding for no apparent reason and/or (in the case of an internal diaphragm leak) very spongy clutch pedal

The clutch shares the reservoir with the brake system.

It's not really possible for the slave cylinder in a hydraulic clutch system to cause the clutch to slip. When these kinds of systems fail they fail in the OTHER direction... The direction that doesn't permit you to disengage the pressure plate from the flywheel. In other words, you'd have no clutch.

The only exception that I can think of is if the slave cylinder got stuck somehow, in the extended position (mechanical/physical failure of the component). This isn't very likely on a late model Mustang because there's no hard pieces connecting the inner and outer portions; only a bellows.


Stuff a quality clutch in that bad boy along with a new OEM slave cylinder and call it a day. It seems like I've seen/heard a lot of stories about folks reusing the original slave then discovering a new leak.