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12-12-2013, 06:56 PM
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#1 |
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Registered User
Join Date: May 2009
Location: Gonzales, LA
Posts: 779
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What diameter clutch?
My clutch on my '70 is slipping (250/3 speed). All the part houses list a 10" and an 11". Which do I need and how would I check to see what's in there now? Need to get one ordered soon.
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1972 Pale Yella 2WD Blazer ..... 350HO/700R4.... '68 Clipped 1970 Original Paint SWB Farm Truck ..... 5.3/4L80.... 2x HRPT Participant |
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12-12-2013, 07:08 PM
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#2 |
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Registered User
Join Date: Oct 2013
Location: Schenectady NY
Posts: 79
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Re: What diameter clutch?
The only sure way to know, is to pull it out and measure the disc. From what I recall, most the trucks used the larger clutch. I'll say i've never seen the smaller in a truck.
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12-12-2013, 07:15 PM
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#3 |
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Registered User
Join Date: May 2009
Location: Gonzales, LA
Posts: 779
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Re: What diameter clutch?
Not exactly what I wanted to hear but definitely more info than I had, thanks. Unless someone else has a different opinion I'll order the 11" and roll the dice that it's the one I need. Thanks
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1972 Pale Yella 2WD Blazer ..... 350HO/700R4.... '68 Clipped 1970 Original Paint SWB Farm Truck ..... 5.3/4L80.... 2x HRPT Participant |
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12-12-2013, 07:19 PM
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#4 |
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Registered User
Join Date: Aug 2004
Location: Eastern Shore VA
Posts: 366
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Re: What diameter clutch?
Fwiw my 67 has an 11" clutch with a 250 and a 3 speed.
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-j-rod '06 3500 LWB CC 4wd, 8.1 Allison |
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12-12-2013, 07:38 PM
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#5 |
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Registered User
Join Date: Aug 2007
Location: orlando
Posts: 456
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Re: What diameter clutch?
11" clutch, BB are 12, & 13".
IMHO......Aways resurface the flywheel, and pressure plate whenever changing the clutch. Like a new relationship, everything will mate up and get along much better when you complete those steps. Make sure to use the spline that should come w/ the new clutch so the disc and pressure plate are aligned correctly. If the trans will not slide in relatively easy, DO NOT force it, and NEVER EVER draw it to the bell housing with the bolts. If you have to do that, someting's wrong. Lastly, don't ask me how I know.
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A man's thoughts devise his ways; but it's GOD that directs his steps. |
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12-12-2013, 08:23 PM
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#6 |
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Registered User
Join Date: May 2009
Location: Gonzales, LA
Posts: 779
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Re: What diameter clutch?
Great info. Preciate it guys, I ordered a new 11" clutch set and flywheel. Figured it be the safest bet.
__________________
1972 Pale Yella 2WD Blazer ..... 350HO/700R4.... '68 Clipped 1970 Original Paint SWB Farm Truck ..... 5.3/4L80.... 2x HRPT Participant |
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12-12-2013, 11:37 PM
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#7 |
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Registered User
Join Date: Apr 2013
Location: South Westerlo, New York
Posts: 1,325
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Re: What diameter clutch?
As long as you have it out it wouldn't hurt to change the input shaft pilot bushing in the end of the crank. theyr'e cheap and easy to remove. fill it with grease and find a dowel the size of the hole and hit it with a hammer. it will come out.
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Thanks, Joe.. 1969 C/10, 348 C.I., 3X2 bbl. V8, 2004r , LWB. Last edited by hamjet; 12-12-2013 at 11:43 PM. |
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12-13-2013, 09:05 AM
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#8 |
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Registered User
Join Date: May 2009
Location: Gonzales, LA
Posts: 779
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Re: What diameter clutch?
The set comes with the clutch, pressure plate, throw out bearing and pilot bearing I believe.
__________________
1972 Pale Yella 2WD Blazer ..... 350HO/700R4.... '68 Clipped 1970 Original Paint SWB Farm Truck ..... 5.3/4L80.... 2x HRPT Participant |
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12-13-2013, 09:45 AM
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#9 |
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Sisyphus was my mentor!
 
Join Date: Sep 2002
Location: Carleton Place, Ontario CANADA
Posts: 984
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Re: What diameter clutch?
If you currently have a 10" clutch, then you can only replace with a 10" due to the flywheel bolt circle. If you have an 11", then you can put an 11" or a 12".
The two ways to know whats in there is if you have something like HD Clutch on your spid, then you have an 11". Be sure to get your flywheel reground.
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passthebuck  #5642 -TWO 1967 GMC 910's. One with L6/3-on-the tree and the other with 355 w/435hp & a 700r4. -a 2013 Honda Civic as my "sensible" car |
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12-13-2013, 04:05 PM
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#10 |
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Registered User
Join Date: May 2009
Location: Gonzales, LA
Posts: 779
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Re: What diameter clutch?
Thanks. Nothing like that on the SPID, mine is almost blank lol. I ordered a new flywheel too.
__________________
1972 Pale Yella 2WD Blazer ..... 350HO/700R4.... '68 Clipped 1970 Original Paint SWB Farm Truck ..... 5.3/4L80.... 2x HRPT Participant |
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