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Joined: Apr 2008
Posts: 196
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I am trying to figure out what clutch I need for my 1980 C-10 with a 250 motor and SM465 Granny Low 4 speed. Some are 11 inch and some are 12 inch. It is 30 degrees outside so I am procrastinating crawling under there since I aint built my fancy garage yet.
250 Integrated Head / 1981 C-10 Pick up.
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Joined: Jul 2000
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The VIN code might be able to tell you, otherwise you'll have to take it apart to find out. Perhaps you could take it to a Chevy dealership shop and they could tell you.
Make sure the parts store has both available, so you're not waiting around for parts once you take it apart...
I.I. #3174
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Joined: Jun 2007
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Wouldn't the 12" clutch take a larger flywheel? Don't those take a different starter?
I'm not sure the exact differences (ie I wouldn't be able to tell you which you had by looking at it, but I'm sure someone here should be able to).
My, what a steep learning curve. Erik II#5155
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Joined: Jul 2000
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No. The 153 tooth flywheels are 10 1/2". 168 tooth can take up to a 13".
Looking at the Checker and Napa websites, and in my Hollander interchange manual, I'm only seeing a 168 tooth 11" clutch as an option. The starter for a 168 tooth has staggered bolts.
I.I. #3174
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Okay, wasn't sure about the starter (The Chev V8 I knew, but even then, I've seen a couple goofy ones from the factory).
Learn something every day, I wan't aware you could put that large a clutch on one of te 168 tooth equiped flywheels.
My, what a steep learning curve. Erik II#5155
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Joined: Apr 2008
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The Truck is out of service right now. I will take the parts with me to the store when I go. I was looking for a reference/manual. I have looked all over the internet for information on this topic and couldnt find anything.
I do have a rebuild kit lined up for the SM-465 Transmission from novak-adapt.com
250 Integrated Head / 1981 C-10 Pick up.
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