C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

clutch dragging...help

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Old Jan 8, 2010 | 12:12 AM
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Default clutch dragging...help

Ok I have a 93 LT1 and just put in a new transmission, new stage 1 clutch kit from gripforce clutches, and a new slave cylinder. I have tried to accomplish the gravity bleed method and cycle the clutch pedal about 50 times. And I have restored full pressure on the clutch pedal. My problem is as follows.

With the rear of the vehicle raised there is some back pressure on the rear wheels with it in gear and the clutch pedal pressed all the way down. However, when I pull it out of gear then there is no back pressure on the rear wheels. What am I doing wrong?

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Old Jan 8, 2010 | 12:50 AM
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If it goes in gear with the wheels down...especially reverse....Then the wheels spinning on the rack is normal.....
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Old Jan 8, 2010 | 02:32 PM
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Originally Posted by jhammons01
If it goes in gear with the wheels down...especially reverse....Then the wheels spinning on the rack is normal.....
The only problem is I have the engine off with the rear of the vehicle raised. And when I put it in first gear with the clutch disengaged(pedal down) you can feel some back pressure on the rear wheels when I spin them by hand. And When I take it out of gear with the clutch disengaged there is no back pressure. Therefore, some reason the clutch is not fully coming off the flywheel.

Could it be a problem with the pressure plate?

Last edited by rogerdoger1993; Jan 8, 2010 at 02:35 PM. Reason: Spelling
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Old Jan 8, 2010 | 02:43 PM
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The explanation given is maybe even the pilot bearing is transferring some rotation to the gears/wheels....

And if it is neutral, of course there would be no power to the wheels.

Are you saying you don't want to put the car down yet??

If that is the case, if you've done something wrong, with the motor running, you'll not be able to get into reverse without some major grindage.

With the wear plates being brand new, they may be just a little oversized and a few miles will cure it.

Last edited by jhammons01; Jan 8, 2010 at 06:49 PM.
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Old Jan 8, 2010 | 02:49 PM
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OMG...I think your right im gonna drop the rear and try shifting to reverse.

Last edited by rogerdoger1993; Jan 8, 2010 at 02:50 PM. Reason: quoted the wrong sentence
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Old Jan 8, 2010 | 03:08 PM
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Well I didnt drop the rear but I started it up with the rear raised and there was no grindage in reverse or first gear. I even tried reving it up will doing that and still no grindage. It shifted as fine as frogs hair.

Last edited by rogerdoger1993; Jan 8, 2010 at 03:08 PM. Reason: spelling
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Old Jan 8, 2010 | 04:15 PM
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It's normal to have some drag on the clutch disc when the pedal is depressed. The disk is sandwiched between the pressure plate and the flywheel and there is some contact with either or both, especially with a new disk. As J stated, the input shaft will also drag on the pilot bushing or bearing. Just as long as the shift engagement is smooth without grinding, you should be fine. Might want to change your terminology. Backpressure usually refers to exhaust gas.
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Old Jan 8, 2010 | 05:43 PM
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Originally Posted by 383vett
It's normal to have some drag on the clutch disc when the pedal is depressed. The disk is sandwiched between the pressure plate and the flywheel and there is some contact with either or both, especially with a new disk. As J stated, the input shaft will also drag on the pilot bushing or bearing. Just as long as the shift engagement is smooth without grinding, you should be fine. Might want to change your terminology. Backpressure usually refers to exhaust gas.
You guys have been a great help. I am just really paranoid that I might mess up another transmission as a result of a poorly maintained clutch hydraulic system. I didnt know then ZF hydraulics were so tempermental.
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