Clutch size in 69 C30 dually with SM 465 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**StingRay** · 03-23-2011, 04:48 PM

Does anybody know if the clutch on a 69 C30 dually with an SM465 is likely to be an 11 or a 12 inch clutch? Mine is chattering and I'd like to relplace it. I'd rather not wait till I have it apart to have to order the new one up. They are asking me the size at the parts store when I try to place an order.

crazy longhorn · 03-23-2011, 04:51 PM

I would say 12".....but 11 or 12 should both fit your flywheel. crazyL

**StingRay** · 03-23-2011, 04:54 PM

So is perhaps the 11" standard duty with the 12 being heavy duty?

Blazer1970 · 03-23-2011, 04:55 PM

12" for sure if it came with a 350 or 400 engine. 99% chance it is 12" no matter what engine in that truck.

tow guys · 03-23-2011, 05:01 PM

I have the same set up in my 70 1 ton GMC and it's a 12 inch clutch plate. Just looked at that very thing over the weekend. Ours is all apart so it was easy to measure the clutch disk..

**StingRay** · 03-23-2011, 05:23 PM

Many thanks

**StingRay** · 03-25-2011, 10:59 AM

So I picked up a 12" clutch. I've done the clutch on a 3 speed before and it was a really simple one man job that I easily accomplished from the bottom. I look at an SM465 with the PTO hooked up and think this one isn't so easy. It's a heavy bugger. For those of you that have done this job what's your take on it and have you got any tips? I'm thinking it might be less work to pull the engine, replace some seals and gaskets at the same time and do the clutch then. Opinions please?

03-23-2011, 04:48 PM	#1
StingRay Senior Member Join Date: Mar 2000 Location: Saskatoon,SK,Canada Posts: 2,476	Clutch size in 69 C30 dually with SM 465 Does anybody know if the clutch on a 69 C30 dually with an SM465 is likely to be an 11 or a 12 inch clutch? Mine is chattering and I'd like to relplace it. I'd rather not wait till I have it apart to have to order the new one up. They are asking me the size at the parts store when I try to place an order. __________________ Saskatoon, Saskatchewan Canada

03-23-2011, 04:51 PM	#2
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,403	Re: Clutch size in 69 C30 dually with SM 465 I would say 12".....but 11 or 12 should both fit your flywheel. crazyL __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

03-23-2011, 04:54 PM	#3
StingRay Senior Member Join Date: Mar 2000 Location: Saskatoon,SK,Canada Posts: 2,476	Re: Clutch size in 69 C30 dually with SM 465 So is perhaps the 11" standard duty with the 12 being heavy duty? __________________ Saskatoon, Saskatchewan Canada

03-23-2011, 04:55 PM	#4
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,510	Re: Clutch size in 69 C30 dually with SM 465 12" for sure if it came with a 350 or 400 engine. 99% chance it is 12" no matter what engine in that truck. __________________ Tim

03-23-2011, 05:01 PM	#5
tow guys Registered User Join Date: Dec 2010 Location: Bayville NJ Posts: 385	Re: Clutch size in 69 C30 dually with SM 465 I have the same set up in my 70 1 ton GMC and it's a 12 inch clutch plate. Just looked at that very thing over the weekend. Ours is all apart so it was easy to measure the clutch disk.. __________________ Check out my 70 GMC tow truck project here.......http://67-72chevytrucks.com/vboard/s...d.php?t=440431 Member of the 1-Ton Club! http://www.eastcoastcarandtruck.org

03-23-2011, 05:23 PM	#6
StingRay Senior Member Join Date: Mar 2000 Location: Saskatoon,SK,Canada Posts: 2,476	Re: Clutch size in 69 C30 dually with SM 465 Many thanks __________________ Saskatoon, Saskatchewan Canada

03-25-2011, 10:59 AM	#7
StingRay Senior Member Join Date: Mar 2000 Location: Saskatoon,SK,Canada Posts: 2,476	Re: Clutch size in 69 C30 dually with SM 465 So I picked up a 12" clutch. I've done the clutch on a 3 speed before and it was a really simple one man job that I easily accomplished from the bottom. I look at an SM465 with the PTO hooked up and think this one isn't so easy. It's a heavy bugger. For those of you that have done this job what's your take on it and have you got any tips? I'm thinking it might be less work to pull the engine, replace some seals and gaskets at the same time and do the clutch then. Opinions please? __________________ Saskatoon, Saskatchewan Canada



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