Clutch spline Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

AirborneC10 · 03-29-2010, 03:23 PM

I've got a 1970 C-10 and I have another motor to drop in it.

I need to order some parts - namely the clutch.

I got this far in my search on Summit:

http://www.summitracing.com/search/P...evrolet+clutch

but now it's asking for disk diameter and talking about the number of splines.

Now someone will say "remove the motor and tranny, split them, and count your splines" and normally i would do that, but I am borrowing the cherry picker and need to have the old motor out, split, the tranny attached to the new motor and back in the truck in a weekend - which means I need to have the clutch ready to install when I remove the old motor.

So can anyone help me choose the right clutch to order?

1970 Chevrolet C-10
Motor: Chevrolet 350 I bought off Craigslist
Transmission: Original 3-speed column shift tranny.

Or am I going to have to split these first?

Shyguy · 03-29-2010, 04:10 PM

If remember right the splines on the clutch are based on transmission.

I got my new clutch kit for my '71 C-10 at Auto Zone for right at $120.

They did not ask me about splines or type of manual transmission and it fit fine and works great. Of course I am only running a mild built 454 with a old style 4 speed. I got the clutch kit for a 350 engine.

I usually try to buy local, that way I can see the parts before I buy them and if they are not right it is easy to take them back.

Hope this helps.

Danny

capev86 · 03-29-2010, 04:55 PM

i want to put the biggest McLeod ceramic clutch in my 72 burb that will fit when i swap in the 406sbc and mate it to the stock column shifter saginaw. will be doing a lot of towing and i don't want a clutch that can take the heat!

Wrenchbender Ret · 03-29-2010, 06:26 PM

It's hard to buy a clutch before you pull the old one. There are a lot of options. The spline count is pretty much the same all through that era but there are sveral different diameters. They go by the dia. of the disc. I agree by it locally.

Jacfourteen · 03-29-2010, 07:21 PM

My four speed sm465 has the coarse spines...I think 8 or 10.

Edit: I just counted the clutch alignment tool I have and it has 10 splines.

**truckdude239** · 03-29-2010, 08:17 PM

my 71 with 3 speed was an 11 inch clutch disc and 10 splines. i bought an ac delo brand fore 160 buxs becaus ei couldn;t get a cheapo clucth from advance auto parts or auto zone to last

**James Pierce** · 03-29-2010, 08:55 PM

I have five man 4 speeds all 465 muncie and one I think made by chev, ie
reverse on left and down. All trannys are 10 splines. The cluthes I have
three on the floor. All are 10 splines. One is from a 69 3/4, by 4 and it is
a twelve in clutch. the other two are 11 in one is from a 6 cyl 1/2 ton and
the other from a 70 1/2 with a 307 cid. Hope this helps you out.

03-29-2010, 03:23 PM	#1
AirborneC10 Registered User Join Date: Apr 2008 Location: Washington, DC Posts: 22	Clutch spline Question I've got a 1970 C-10 and I have another motor to drop in it. I need to order some parts - namely the clutch. I got this far in my search on Summit: http://www.summitracing.com/search/P...evrolet+clutch but now it's asking for disk diameter and talking about the number of splines. Now someone will say "remove the motor and tranny, split them, and count your splines" and normally i would do that, but I am borrowing the cherry picker and need to have the old motor out, split, the tranny attached to the new motor and back in the truck in a weekend - which means I need to have the clutch ready to install when I remove the old motor. So can anyone help me choose the right clutch to order? 1970 Chevrolet C-10 Motor: Chevrolet 350 I bought off Craigslist Transmission: Original 3-speed column shift tranny. Or am I going to have to split these first?

03-29-2010, 04:10 PM	#2
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: Clutch spline Question If remember right the splines on the clutch are based on transmission. I got my new clutch kit for my '71 C-10 at Auto Zone for right at $120. They did not ask me about splines or type of manual transmission and it fit fine and works great. Of course I am only running a mild built 454 with a old style 4 speed. I got the clutch kit for a 350 engine. I usually try to buy local, that way I can see the parts before I buy them and if they are not right it is easy to take them back. Hope this helps. Danny __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E.

03-29-2010, 04:55 PM	#3
capev86 Registered User Join Date: May 2009 Location: Eliot, Maine Posts: 1,314	Re: Clutch spline Question i want to put the biggest McLeod ceramic clutch in my 72 burb that will fit when i swap in the 406sbc and mate it to the stock column shifter saginaw. will be doing a lot of towing and i don't want a clutch that can take the heat!

03-29-2010, 06:26 PM	#4
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,216	Re: Clutch spline Question It's hard to buy a clutch before you pull the old one. There are a lot of options. The spline count is pretty much the same all through that era but there are sveral different diameters. They go by the dia. of the disc. I agree by it locally.

03-29-2010, 07:21 PM	#5
Jacfourteen Big Red - Now its a SWB! Join Date: Jun 2009 Location: Oroville, Ca Posts: 1,624	Re: Clutch spline Question My four speed sm465 has the coarse spines...I think 8 or 10. Edit: I just counted the clutch alignment tool I have and it has 10 splines. __________________ 68 3/4 ton (Project)-350 Small Block, .030 over, 10:1 comp, 3998993 heads, C3BX edelbrock intake, comp cams XE268, Holley 670 SA, long tube headers, dual flow 40's, E-fan, Alum rad, currently under the knife getting shortened and bagged build thread 41 3/4 ton (wife's)-flatbed, fully restored to original 01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's Last edited by Jacfourteen; 03-29-2010 at 07:43 PM.

03-29-2010, 08:17 PM	#6
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,234	Re: Clutch spline Question my 71 with 3 speed was an 11 inch clutch disc and 10 splines. i bought an ac delo brand fore 160 buxs becaus ei couldn;t get a cheapo clucth from advance auto parts or auto zone to last __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

03-29-2010, 08:55 PM	#7
James Pierce Active Member Join Date: Feb 2009 Location: Cle Elum, Washington Posts: 164	Re: Clutch spline Question I have five man 4 speeds all 465 muncie and one I think made by chev, ie reverse on left and down. All trannys are 10 splines. The cluthes I have three on the floor. All are 10 splines. One is from a 69 3/4, by 4 and it is a twelve in clutch. the other two are 11 in one is from a 6 cyl 1/2 ton and the other from a 70 1/2 with a 307 cid. Hope this helps you out. __________________ cascadeheavychevy 67 C10 327 4speed 69 C20 350 4WD 4speed 69 C20 350 4WD 4speed 69 C20 350 4 soeed 69 C20 CST 350 Auto 70 C10 307 4speed 71 GMC Supr 350 Auto 70 C10 350 Auto 67 CST 327 Auto



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