Drivetrain Clutch Sizing

Dylan Rollheiser

New Member
Aug 6, 2013
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So i went to go install my 10.5 inch ram hdx clutch kit and its too small for my car. I took a tape measure and i measured 11.5 inch surface diameter on the stock pp and disc that was in the car. So before i send my wrong clutch back to summit and get a new one, what size to i need? The only other size i can see on their website is a 11 inch clutch whih still doesnt seem right. Anyone wanna help?
 
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Might help to mention the model year of your Mustang.

But in general, the Mustang only uses two clutch sizes. 10.5" for 2000 and older. 11" for 2001+.

I suspect that you are measuring using the incorrect reference points. What is the diameter of the bolt pattern on the flywheel?
 
Car is a 99 but has an older npi motor from a 96-98 car. I bought a 10.5 ram clutch and it was just too small. I measure the disc diameter and the clamp surface on the pressure plate on it and theyre both 10.5. On the cars clutch it was 11.5 for those dimensions.