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Difference in Fan Clutch w/Rear Gear Ratio ?? #515706
11/03/09 11:34 PM
11/03/09 11:34 PM
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44D6PAKCUDA Offline OP
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44D6PAKCUDA  Offline OP
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I was looking at an aftermarket fan clutch for my '70 340 Duster and noticed that they showed one fan clutch for a 340 car w/271/276 rear end gears and another clutch for 355/391 gears.What would be the difference?Both are showing to be a 6" diameter clutch.Why wouldn't they interchange?Just courious

Re: Difference in Fan Clutch w/Rear Gear Ratio ?? [Re: 44D6PAKCUDA] #515707
11/04/09 04:54 PM
11/04/09 04:54 PM
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Rio Linda, CA
John_Kunkel Offline
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The factory parts book breaks them down the same way, one clutch is thermal, the other isn't.


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Re: Difference in Fan Clutch w/Rear Gear Ratio ?? [Re: John_Kunkel] #515708
11/04/09 08:47 PM
11/04/09 08:47 PM
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S.E. Conn
Hoof Hearted Offline
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Good question.

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Re: Difference in Fan Clutch w/Rear Gear Ratio ?? [Re: Hoof Hearted] #515709
11/04/09 11:31 PM
11/04/09 11:31 PM
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44D6PAKCUDA Offline OP
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So a thermal fan clutch has a raised center and a non-thermal clutch would be flat?

Re: Difference in Fan Clutch w/Rear Gear Ratio ?? [Re: 44D6PAKCUDA] #515710
11/05/09 10:22 AM
11/05/09 10:22 AM
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Outing, MN
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beesuperA12 Offline
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In the aftermarket,most thermal fan clutches have a bi-metalic spring on the radiator side that changes the orifice that the fluid in the clutch flows through, increasing or decreasing drag. Non thermal rely on simple fluid friction.


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Re: Difference in Fan Clutch w/Rear Gear Ratio ?? [Re: beesuperA12] #515711
11/05/09 09:27 PM
11/05/09 09:27 PM
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Posts: 2,295
Land of 10,000 Lakes
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44D6PAKCUDA Offline OP
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Any idea if they would be interchangable with each other or any problems by putting say a thermal clutch on a car that calls for a non thermal clutch?







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