IF you run a manual trans.... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Tom Vogel** · 03-24-2010, 11:05 PM

Which of these two clutch/brake pedal assymblies are right? The one on the left reportedly came out of an automatic equipped truck... notice the stud circled in red? Its for a big return spring for a clutch pedal. The other more rusty bracket came out of a standard/manual trans truck... notice the return spring circled in red.
Which setup is correct... or do you need both springs? Ive got a NOS clutch pedal and its got holes for both return springs. ??? Which is right/better? One spring or both or???

Whats on your truck?

Dingfodgy · 03-25-2010, 12:45 AM

The pedal assembly I just pulled out of my shorty with SM420 manual trans looks just like that rusty one in your pics. I'm thinking the other setup is from a '73+ model? But I could be wrong.

DonsCST · 03-25-2010, 12:54 AM

I just went out and looked at mine, 70 Chevy CST, 4 speed,350. It looks exactly like the one on the left. Hope that helps.

NORMSCOLORADO · 03-25-2010, 01:10 AM

hey man my 67 has the one that is in question (left) im runnin a327 with a 4 speed and there is no return spring on it and mine works fine just has the spring on the clutch fork... if u want i can take a pic of it tomorrow.

Trip59 · 03-25-2010, 03:20 AM

I bought one to put in mine for my conversion (PO cut the clutch pedal off with a hacksaw when they put the auto in...) both the one that came out of my 72, and the one that went in look identical to the one on the right.

Trip

**Tom Vogel** · 03-25-2010, 08:51 AM

Quote:

Originally Posted by DonsCST

I just went out and looked at mine, 70 Chevy CST, 4 speed,350. It looks exactly like the one on the left. Hope that helps.

DonCST... is your truck a 4X4? I think the other trucks are 2wd. How about a picture of your z-bar? Maybe thats the difference.
What do you guys think?

SNEAKYPETE · 03-25-2010, 10:50 PM

The rusty one on the right is the exact one that is in mine. All you need to do is remove the clutch pedal from that assembly with its bushing and install it into your stock one, the automatic style is exactly the same minus just the clutch pedal. I bought a whole assembly but added just the clutch pedal to mine with no problems. I run a hydraulic clutch so i didnt need much spring i only used the one softer spring.

DonsCST · 03-25-2010, 11:17 PM

Sorry, I forgot to mention that mine is a 4x4. I'll try to post a pic soon.

**Tom Vogel** · 03-25-2010, 11:49 PM

I am only guessing, but I bet the 4X4 Z-bar setup is different than the 2WD. So maybe there isnt a return spring on the 4X4 Z-bar.... then you would need the big vertical return spring on the clutch pedal?

DonsCST · 03-26-2010, 12:24 AM

Just went out and looked again. There is a heavy duty return spring on my clutch pedal, about 6" of spring,approx. 1 1/4" around and attaches about halfway down the clutch pedal. No I know why my left leg is bigger than my right

Also went out and looked at my 72 GMC, 2 w/d, 307,short bed, basket case project, 3 on the tree from factory, but has a 4 on the floor, it looks exactly like the assembly on the right in the pics.

vectorit · 03-26-2010, 12:25 AM

Mine is like the one on the left.
Here is a not so good picture, but it shows the large spring on the pedal lever.

CE20934 · 03-26-2010, 10:16 PM

That big vertical spring is both a return and an assist spring. When the pedal goes past half-depressed, the spring starts to shorten again, thereby giving your left leg a little help in fully disengaging the clutch.

My '67 has the massive spring setup.

gm4x4chris · 03-26-2010, 10:22 PM

i just went through this very same deal when assembling my truck out of several , the pedal assembly on the left matches the setups i have out a 69 and 70 model truck the one on the right matches the ones that i have out of both of my 72 model trucks i currently have the 69 assembly in my 72 and everything hooked up and worked fine for me.

**Tom Vogel** · 03-27-2010, 01:27 AM

Quote:

Originally Posted by CE20934

That big vertical spring is both a return and an assist spring. When the pedal goes past half-depressed, the spring starts to shorten again, thereby giving your left leg a little help in fully disengaging the clutch.

My '67 has the massive spring setup.

OK, but is your truck a 4X4 or was it at 4X4 at one time or in a previous life??

CE20934 · 03-27-2010, 10:43 AM

Quote:

Originally Posted by Tom Vogel

OK, but is your truck a 4X4 or was it at 4X4 at one time or in a previous life??

Nope. It's been a 2WD all its life.

**Tom Vogel** · 03-27-2010, 12:14 PM

Quote:

Originally Posted by CE20934

Nope. It's been a 2WD all its life.

OK... last question (I promise)... was your truck originally a manual or was it converted to a manual from an automatic? Im just trying to determine if there was a reason to have one bracket or the other in these trucks... and so far, unless its the 4X4 thing, I cant come up with a reason.

CE20934 · 03-27-2010, 11:59 PM

Quote:

Originally Posted by Tom Vogel

OK... last question (I promise)... was your truck originally a manual or was it converted to a manual from an automatic? Im just trying to determine if there was a reason to have one bracket or the other in these trucks... and so far, unless its the 4X4 thing, I cant come up with a reason.

No biggie. It's been a 4spd all its life too. It has the removable tunnel.

After rereading the thread, I had a thought: I bet the trucks with the high hump (4spd, 4WD, BB) all came with the massive spring setup since they were the ones most likely to get the HD 12" clutch. I have no hard evidence for this thought other than most of the 4spd trucks in the thread have the big spring.

chevytrucks · 03-31-2010, 12:26 AM

72 half ton 4x4 4 speed never been anything other. Identical to the black one in your pic.
Like someone else said it is a return/assist spring that you don't absolutely need. for the sake of ending curiosity I took mine off and tried it. It still works but not as smooth. hope this helps.

03-24-2010, 11:05 PM	#1
Tom Vogel 2WD Jimmy Join Date: Mar 2005 Location: Davis County, Utah Posts: 2,564	IF you run a manual trans.... Which of these two clutch/brake pedal assymblies are right? The one on the left reportedly came out of an automatic equipped truck... notice the stud circled in red? Its for a big return spring for a clutch pedal. The other more rusty bracket came out of a standard/manual trans truck... notice the return spring circled in red. Which setup is correct... or do you need both springs? Ive got a NOS clutch pedal and its got holes for both return springs. ??? Which is right/better? One spring or both or??? Whats on your truck? Attached Images Last edited by Tom Vogel; 03-25-2010 at 12:32 AM.

03-25-2010, 12:45 AM	#2
Dingfodgy Lemme show you something!! Join Date: Apr 2007 Location: St.Helens, OR. Posts: 876	Re: IF you run a manual trans.... The pedal assembly I just pulled out of my shorty with SM420 manual trans looks just like that rusty one in your pics. I'm thinking the other setup is from a '73+ model? But I could be wrong. __________________ '67 CST-10 LWB ("Crusty") SOLD '67 GMC SWB ("Murdock") 2000 K1500 Suburban ("Betty") '95 BMW 325i ("Joy")

03-25-2010, 12:54 AM	#3
DonsCST Registered User Join Date: Jul 2009 Location: NewMexico Posts: 59	Re: IF you run a manual trans.... I just went out and looked at mine, 70 Chevy CST, 4 speed,350. It looks exactly like the one on the left. Hope that helps.

03-25-2010, 01:10 AM	#4
NORMSCOLORADO Registered User Join Date: Oct 2008 Location: JAY, NY Posts: 176	Re: IF you run a manual trans.... hey man my 67 has the one that is in question (left) im runnin a327 with a 4 speed and there is no return spring on it and mine works fine just has the spring on the clutch fork... if u want i can take a pic of it tomorrow. __________________ 04 Chevy Colorado Z71 4X4 76 Chevy C-10 Custom Deluxe (sold) 67 Chevy C-30 1 Ton 9' stepper 6.5 Turbo Diesel Last edited by NORMSCOLORADO; 03-25-2010 at 01:11 AM.

03-25-2010, 03:20 AM	#5
Trip59 Who needs sleep... Join Date: Aug 2009 Location: Middleburg, Florida Posts: 260	Re: IF you run a manual trans.... I bought one to put in mine for my conversion (PO cut the clutch pedal off with a hacksaw when they put the auto in...) both the one that came out of my 72, and the one that went in look identical to the one on the right. Trip

03-25-2010, 10:50 PM	#7
SNEAKYPETE Registered User Join Date: Nov 2005 Location: SEATTLE Posts: 58	Re: IF you run a manual trans.... The rusty one on the right is the exact one that is in mine. All you need to do is remove the clutch pedal from that assembly with its bushing and install it into your stock one, the automatic style is exactly the same minus just the clutch pedal. I bought a whole assembly but added just the clutch pedal to mine with no problems. I run a hydraulic clutch so i didnt need much spring i only used the one softer spring.

03-25-2010, 11:17 PM	#8
DonsCST Registered User Join Date: Jul 2009 Location: NewMexico Posts: 59	Re: IF you run a manual trans.... Sorry, I forgot to mention that mine is a 4x4. I'll try to post a pic soon.

03-25-2010, 11:49 PM	#9
Tom Vogel 2WD Jimmy Join Date: Mar 2005 Location: Davis County, Utah Posts: 2,564	Re: IF you run a manual trans.... I am only guessing, but I bet the 4X4 Z-bar setup is different than the 2WD. So maybe there isnt a return spring on the 4X4 Z-bar.... then you would need the big vertical return spring on the clutch pedal?

03-26-2010, 12:24 AM	#10
DonsCST Registered User Join Date: Jul 2009 Location: NewMexico Posts: 59	Re: IF you run a manual trans.... Just went out and looked again. There is a heavy duty return spring on my clutch pedal, about 6" of spring,approx. 1 1/4" around and attaches about halfway down the clutch pedal. No I know why my left leg is bigger than my right Also went out and looked at my 72 GMC, 2 w/d, 307,short bed, basket case project, 3 on the tree from factory, but has a 4 on the floor, it looks exactly like the assembly on the right in the pics.

03-26-2010, 12:25 AM	#11
vectorit What? Join Date: Jun 2007 Location: Southern California Posts: 7,617	Re: IF you run a manual trans.... Mine is like the one on the left. Here is a not so good picture, but it shows the large spring on the pedal lever. Attached Images __________________ Chris 1968 K20 Suburban 1972 K10 LWB PU

03-26-2010, 10:16 PM	#12
CE20934 Senior Member Join Date: Apr 2002 Location: Help! I'm in an office park with its own network of freeways! Posts: 470	Re: IF you run a manual trans.... That big vertical spring is both a return and an assist spring. When the pedal goes past half-depressed, the spring starts to shorten again, thereby giving your left leg a little help in fully disengaging the clutch. My '67 has the massive spring setup. __________________ '67 C20--427 tall deck/SM420, 4.10 HO52 (Michigan has not been kind to the Old Man) '95 Caprice--355 LT1/T56/3.42 8.5" 10-bolt (daily driver, almost 300k on the chassis) '07 Outback--wife's car. 125k & counting. No head gasket or transmission issues yet. fingers crossed

03-26-2010, 10:22 PM	#13
gm4x4chris Registered User Join Date: Feb 2010 Location: New Port Richey Fl Posts: 25	Re: IF you run a manual trans.... i just went through this very same deal when assembling my truck out of several , the pedal assembly on the left matches the setups i have out a 69 and 70 model truck the one on the right matches the ones that i have out of both of my 72 model trucks i currently have the 69 assembly in my 72 and everything hooked up and worked fine for me.

03-31-2010, 12:26 AM	#18
chevytrucks Registered User Join Date: Feb 2010 Location: Sandpoint Idaho Posts: 25	Re: IF you run a manual trans.... 72 half ton 4x4 4 speed never been anything other. Identical to the black one in your pic. Like someone else said it is a return/assist spring that you don't absolutely need. for the sake of ending curiosity I took mine off and tried it. It still works but not as smooth. hope this helps.



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