What size clutch do I have - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 04-29-2002, 07:04 PM Thread Starter
 
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What size clutch do I have

Anyone know what size clutch I would have in my 78K25 350/SM465 8600lb gvw??

And how many teeth on the flywheel??

Thanks
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post #2 of (permalink) Old 04-30-2002, 09:53 AM
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Re: What size clutch do I have

Probably an 11" or 12" clutch. Probably a 12"

The ring gear on the flywheel should have 153 teeth I think. Diesels have 168?
post #3 of (permalink) Old 04-30-2002, 06:54 PM Thread Starter
 
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Re: What size clutch do I have

Thanks, but I need to know if I have an 11 or a 12.. is there anyway to figure this out from the outside?

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post #4 of (permalink) Old 05-01-2002, 08:11 AM
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Re: What size clutch do I have

I personally don't know of a way to tell the difference without pulling the engine or transmission. The clutch disk (this is what's referred to as 11" or 12") is sandwiched in between the flywheel and the pressure plate - and the pressure plate is bolted to the flywheel. If I'm not mistaken, pressure plates for 11" and 12" clutches are the same size.

Like I said... judging from the specs you have in your profile, it's probably a 12" clutch.

Just food for thought... an 11" clutch is not exactly 11.0" in diameter, nor is a 12" clutch 12.0". I can't recall the exact numbers for an 11", but I think a 12" is 11.7" or 11.8".
post #5 of (permalink) Old 05-01-2002, 06:47 PM Thread Starter
 
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Re: What size clutch do I have

Ok, thats what I was affraid off.. Now, I have a flywheel bellhousing, and clutch fork off a truck with a 12" clutch (will check on this, make sure it wasn't 11).

If I buy a 12" clutch to match my flywheel, can I just do a straight swap on the 11"clutch and flywheel?? or am I going to run into problems with my bellhousing, and/or clutch linkage stuff?

Thanks for the help man, I don't think I'll have the option of taking it apart, and then buying the clutch.
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post #6 of (permalink) Old 05-02-2002, 08:39 AM
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Re: What size clutch do I have

I would check to make sure, but I think the only difference between an 11" and 12" clutch is the size of the clutch disk itself -> the transmission bell housing, flywheel and clutch fork I know are the same for both an 11" and 12". I'm pretty sure the pressure plate is the same for the 11" and 12" clutches as well.

You shouldn't run into any problems converting from an 11" to a 12" clutch... AS LONG AS you stay with a standard diaphragm spring pressure plate. Don't let the parts people talk you into a 3 prong "performance" pressure plate - they require a different clutch fork and (from what I have heard) make the clutch pedal a lot harder to push down.

Be sure to install a new pressure plate and get the flywheel turned when you do the job - it sux to put a clutch in and find that the truck is barely driveable because you tried to save a few bucks and not turn the flywheel or you reused a pressure plate.
post #7 of (permalink) Old 05-02-2002, 07:04 PM Thread Starter
 
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Re: What size clutch do I have

Thanks for the info.

I was planning on staying with a standard heavy duty clutch, not a centerforce or something fancy.. My friend has a dual friction in his 3+3 and he says it really grabs and it's difficult to feather it.

Thanks again.

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post #8 of (permalink) Old 05-03-2002, 10:19 AM
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Re: What size clutch do I have

I've mentioned it a bunch of times before on this board, but I'm a fan of LUK products... from what I have heard, Centerforce uses some LUK parts for their clutch... why not eliminate the middle man?
post #9 of (permalink) Old 05-03-2002, 11:22 AM
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Re: What size clutch do I have

hmmmm think I got 12" clutch to replace my old wore out one, and Im pretty sure it had 12" on it. but yeah like the rest said the stuff should work weather you got 11" or 12" one.

Im thinking I should have got heavy duty centerforce or something cause now I can slip mine alittle more then Id like, if Im 4 low trying to go up a almost 90d ledge I can get it to slip pretty easy.

the one I got was just napa one off the shelf

Evan
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post #10 of (permalink) Old 05-03-2002, 03:08 PM
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Re: What size clutch do I have

One of these days I will have to replace mine and then I will know for sure what I have.
According to the PO he installed a flywheel and clutch out of a C60 dump truck.
It is a lot bigger looking than other rigs I have seen and it will not slip for anything.
He said he was tired of frying clutches so he dropped in that one, problem solved.
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