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Old 02-16-2006, 02:16 PM
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pressure plate/clutch disc question

ME AND a buddy installed the four speed into his 79 trans am. i noticed when we put the pressure plate over the clutch disc it was close but it went and all bolts went in and it flushed up good. Now we are starting to worry a little.

we looked up the part number and its an 11" clutch disc (centerforce). we are unsure the size of the pressure plate(ram)..

..my question..

would a 10.5 pressure plate fit over an 11" clutch?

.

any tests i can do?
this is a pontiac 400.

thanks in advance.
Rusty Carr.

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Last edited by pi71; 02-16-2006 at 02:53 PM. Reason: re title
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Old 02-16-2006, 02:34 PM
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Clutch disc are usually the same approx. diameter as the pressure plate. The disc however has a side that is usually marked FlyWheel side...If you put the disc in backwards you will have problems. The flatest side of the disc goes towards the flywheel.
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Old 02-16-2006, 02:50 PM
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Yes i understand that,,we did that properly, my question is will a 11" clutch disk work with a 10.5" pressure plate? these items were bought seperatly not together and we think we might have a 11" disk with a 10.5 pressure plate and i want to know if it will work. thanks.
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Old 02-16-2006, 03:29 PM
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Nevermind i figured out that we have a 11" pressure plate with the 11" clutch disc. worrys fixed. just did a little research.
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Old 02-16-2006, 04:53 PM
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I'm thinking what you ended up doing was fitting the pressure plate to the clutch disc and flywheel but failed to remember that when you put them together without the bolts tightened you will have to bolt the pressure plate to the flywheel and the spring load will then be applied, making things seem tight, which they should be.
The pressure will be there until you apply the throwout bearing.

You did things right, either way.
But like most of the rest of us when something goes right and easy you start to wonder if you did something wrong.
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Old 02-18-2006, 02:50 PM
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Here's a true story.

I pulled a clutch from a 68 Mustang once and it had a 3 finger 10 inch pressure plate and a 10 1/2 inch disk in it.... and it worked fine. It was a shock to see the disk sticking out from under the pp 1/4 inch all around..
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Old 02-18-2006, 04:49 PM
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Experience has taught me to make a close check on on the clutch palte springs and flywheel bolts to make sure they don't make contact with each other. If the hub of the clutch disc is not offset towards the rear the springs in the disc hub will ride against the bolts and not let the disc set against the flywheel properly. I ran into this with an 11 in clutch in my GTO a couple of years ago.I even used the thin head Mr. Gasket flywheel bolts when I installed my Hays flywheel. Corrected the problem by installing a disc for a 70-71 455 GTO. Most replacement 11 inch discs are designed for a Chevrolet which does not require the offset disc. May be wise to pull it back apart and check this otherwise you'll experience alot of clutch slippage.
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