67-72 with factory hydro clutch!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*racedvl* · 03-28-2002, 09:51 PM

Well, according to one of my part catalogs from work, C-60's came with hydro clutch systems. Now the question is.....can it be adapted to light duty trucks.......hhhhhmmmm.....

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http://hometown.aol.com/racedvl/racedvl69index.html

Woodstock,IL.northwest of Chicago

It's not what you buy, it's what you build!!

I did not climb to the top of the food chain, to become a vegetarian.

For some pics of my truck.

Z16 · 03-28-2002, 10:09 PM

I ask why? Any hydro clutch I have ever driven has been very slow to release. I think a linkage one or a cable one is much more effective. I understand a hydro one for a tranny swap in something unusual, but why for a 67-72? Just wondering.

*Fast68Chevy* · 03-28-2002, 10:10 PM

most likely since the bellhousings, trannies firewalls and such are identical to 10-30 series,.
I found the GM description on page 54 of Engine and Clutch section:
"Both mechanical and hydraulic clutch controls are utilized. On models using the hydraulic control system, a master cylinder and resrvoir(integral with the brake master cylinder housing) contain hydraulic fluid which is forced through the hydraulkic line when the clutch pedal is depressed. The fluid actuates the slave cylinder which moves the clutch fork, relaeasing the clutch. Releasing the clutch pedal engages the clutch".

Pretty uninformative description, but shows hydraulic was used. I know where a 68-70 C60 dumptruck is sitting in a local towing yard gonna be scrapped, hmm... I may grab the doors off it and there isnt much on it that hasnt been abused, i knew the guy it got impounded from, he cant get it back now, poor truck... its huge dumptruck.... I drove it a couple times to clinton landfill to dump it.. the brakes sucked ass and were very scary when loaded down...

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Randy- Lincoln, IL
randy@ccaonline.com
-71/C-10(thx teeitup and crews!)350 4+4/CH465(thx 71Chev, GMCPaul, and CPNE)longfleet bed(thnx meathead95)!still building it-
-'84 Z28 H.O. 305 L69 700R4 GT4 3.73
- 1984 Firebird SE 2.8L T-5 GT4 3.73
-1981 Cutlass Supreme, dunno what im gonna do with it yet...
-79 G20 pass van, 350/th350/10bolt
*Paint is overrated
© RSS Enterprises 2000

[This message has been edited by Fast68Chevy (edited March 28, 2002).]

j-dogg · 03-28-2002, 10:12 PM

I'd sure like a hydro clutch in my truck. My knee gets pretty tired pushing it in all day (I think that should answer your question, Z16).

**68SWB4x4** · 03-29-2002, 01:32 AM

manual brakes and 12" clutch and manual steering, get a workout while driving a great truck!

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My Truck pictures

www.xframeimpala.com

68 4x4 short fleetside 327 CH465 edelbrock intake and carb MSD distributor its the "SHAGROLET"
56 big window short stepside 235 dual 1 brls
64ImpalaSS 327
70 C10 LWB fleetside custom/10 350/TH350
IM me on aol SN= SHAGROLET

Project1970 · 03-29-2002, 01:41 AM

Z16 - Go take a new Camaro out for a spin and then tell me that a hydraulic is slow to release.

The one in the '94 Z28 bites quick and bites hard. Of course, also upgraded it halfway to the LT4 clutch...just the pressure plate, stock LT1 disc...

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Project 1970 - soon to be seen at http://milhouse.treylis.org:81/

CoryM · 03-29-2002, 01:46 AM

Explain this to me, most hydraulic clutches are purposly inneffective so that you can actually feel the pedal. On HD equipment with manual clutch the hydraulics are so strong you can't feel the clutch at all. So uh, whats the point of having a hydraulic clutch on a light duty car/truck thats just as hard to push? Yes my 78 3/4 gmc clutch pedal is maybe too much for some people but definatly not worth the effort to convert.
BTW if you do convert you can just use almost any master/slave setup with custom brackets. I would not recomend one from newer than about 97, the slaves are plastic and very poorly made. For those who don't know the way hydraulic clutches work is just like the brakes: you press pedal which pushes a piston in the master cylinder which is say 1/2" big which because of Bernallis (sp?) principle causes the slave cylinder with a bigger piston move out with more force (but moves slower). the slaves piston pushes directly on the clutch fork in most applications. Very simple setup, but not nearly as simple as a mechanical linkage

.
Happy Trucking.
CoryM

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1970 heavy duty C-10 fleetside sport truck. Vancouver B.C. Canada
http://www.geocities.com/chevroletc1070

"Take up our quarrel with the foe:
To you from failing hands we throw
The torch; be yours to hold it high."
Lieutenant Colonel John McCrae, Canadian Army

Huck · 03-29-2002, 08:03 AM

Thought! Chevy changed to Hydro clutch on their trucks--why? I put a 96 chevy truck 5 speed with hydro clutch in my 72. Engagement speed, lockup, leg pressure, all no problem as long as you are not in traffic all day and then a mechanical clutch would be just as big a pain. My 5 speed will give me over 20mpg with a 350, edelbrock, HEI, 308posi. Biggest problem was the firewall linkage and driveshaft length. The slave cylinder is actually built into the throwout bearing assm as there is no clutch release arm!!!! Mounted the clutch master cyl on a plate and fastened it to the firewall- centered from the brake booster. BTW, also have a C5 vette with hydro clutch that is in fact easier to depress and Holds like a raped ape! Chevy didn't go this way for fun--it's cheaper with less parts just like their changeover torsion bar front suspension on 4x4 trucks.
JMO------Huck

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72 Cheyenne, 350, 5spd, LWB, Super trim.
71 GMC JIMMY 4X4 --needs stuff-!

*racedvl* · 03-29-2002, 10:45 PM

For beating the sh*t out of something, I like the hydro clutch. I find they are usually a little easier to push. But I also like the feel of a manual rod set up as well. I just know that some people were interested in a hydro set-up, and I figured this would be a good way to possibly convert.

------------------

http://hometown.aol.com/racedvl/racedvl69index.html

Woodstock,IL.northwest of Chicago

It's not what you buy, it's what you build!!

I did not climb to the top of the food chain, to become a vegetarian.

For some pics of my truck.

Mike C · 03-30-2002, 10:35 AM

There is nothing inherently wrong with either system, but both are subject to all of the parts that make up the system. Newer trucks have diaphragm pressure plates while at least my Jimmy, has a Borg & Beck 12" pressure plate. I don't find the mechanical clutch to be too difficult, but all of the linkage is subject to wear which changes the geometry and adjustment. I completely rebuil the linkage in my truck and it made a huge difference. I've worked on many hydraulic clutches and the feel is dependent on the pressure plate, the master cylinder diameter and throw, the clutch pedal linkage/pivot ration and the diameter and throw of the slave cylinder. Making an all encompassing statment about the inferiority of hydraulic clutches is like saying hydraulic brakes like accurate feel as well and we should return to mechanical brakes... FYI it is still against the law, technically, to drive barefoot in Texas because mechanical brakes got so hot that you couldn't keep your bare foot on the pedal.

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70 GMC 3/4 ton Sierra Grande 402/TH400
72 Jimmy 4WD 4spd 4" & 35's
64 Corvette Coupe
68 Camaro 'vert TPI & TH700
69 Z/28 355 12.6's @110
72 Datsun 240Z-ol' reliable

lukecp · 03-30-2002, 11:33 AM

GM also used a hydraulic clutch in the early 60's light trucks, '60-63 i believe. I wonder if the parts from one of those could interchange to a 67-72. I would like to put a 5spd in my truck, but the hydraulic clutch would be a problem.

------------------
Lucas

"Another proud owner of one of the coolest trucks ever built"

drop_shift@hotmail.com

My Daily-Driver: '72 Chevy LWB Custom/10. Rebuilt 350, 300 HP thanks to a few go-fast goodies. Ochre with a white top. Future plans include a frame off restoration, and maybe a blown 383.

Luckymic34 · 03-30-2002, 12:10 PM

Oooooouuuucccchhhh, Sorry just burnt my foot on my brake pedal. He he he! You might be a redneck if....

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68 custom stepside
350 with Carter 650, Weiand intake, HEI,
Crane Enegizer 266 cam, Headmen headers
40 series Flowmasters, B&M hole shot
2,000 rmp stall, TCI TH350 Streetfighter,
4.10 gears
Virginia Beach, VA by way of
Houston, TX

*racedvl* · 03-30-2002, 11:18 PM

LOL!!

------------------

http://hometown.aol.com/racedvl/racedvl69index.html

Woodstock,IL.northwest of Chicago

It's not what you buy, it's what you build!!

I did not climb to the top of the food chain, to become a vegetarian.

For some pics of my truck.

03-28-2002, 09:51 PM	#1
racedvl Account Suspended Join Date: Jan 2000 Location: Woodstock, IL Posts: 7,020	67-72 with factory hydro clutch!!! Well, according to one of my part catalogs from work, C-60's came with hydro clutch systems. Now the question is.....can it be adapted to light duty trucks.......hhhhhmmmm..... ------------------ http://hometown.aol.com/racedvl/racedvl69index.html Woodstock,IL.northwest of Chicago It's not what you buy, it's what you build!! I did not climb to the top of the food chain, to become a vegetarian. For some pics of my truck.

03-28-2002, 10:09 PM	#2
Z16 Registered User Join Date: Mar 2001 Location: Medicine Hat, Alberta, Canada Posts: 1,509	I ask why? Any hydro clutch I have ever driven has been very slow to release. I think a linkage one or a cable one is much more effective. I understand a hydro one for a tranny swap in something unusual, but why for a 67-72? Just wondering. __________________ 98 GMC Sierra Ex Cab, cowl hood, Euro LED lights, 30 bar billet, Whipple Supercharged 350 Vortec: Forged flattops, E-Tec aluminum heads, Comp Cam, Scat crank and rods, Granatelli Mass air flow, Headers, Flowmaster exhaust , Complete MSD Ignition, Custom Tuning, intake spacer , ported throttle body, AC Delco port injection upgrade, Roller Rockers, Power Pulleys. Gear Vendors Overdrive. Soon to hit a dyno. 2/4 drop(for now). 95 Chevy S-10 Ex Cab 4.3 5 Speed 2/3 drop, Euro lights, billet grill, More to come. The Daily Driver

03-29-2002, 01:32 AM	#5
68SWB4x4 Strongman Garage Join Date: Apr 2000 Location: Salinas, CA Posts: 10,241	manual brakes and 12" clutch and manual steering, get a workout while driving a great truck! ------------------ My Truck pictures www.xframeimpala.com 68 4x4 short fleetside 327 CH465 edelbrock intake and carb MSD distributor its the "SHAGROLET" 56 big window short stepside 235 dual 1 brls 64ImpalaSS 327 70 C10 LWB fleetside custom/10 350/TH350 IM me on aol SN= SHAGROLET __________________ Kalle 68 GMC Suburban 1500 4x4 SOLD 69 Pontiac Lemans 99 Silverado 4.8 5 speed ECSB [ Facebook Instagram Subscribe on YOUTUBE

03-29-2002, 01:41 AM	#6
Project1970 14.1 @ 96MPH Join Date: Jul 2001 Location: Mesa, AZ Posts: 2,811	Z16 - Go take a new Camaro out for a spin and then tell me that a hydraulic is slow to release. The one in the '94 Z28 bites quick and bites hard. Of course, also upgraded it halfway to the LT4 clutch...just the pressure plate, stock LT1 disc... ------------------ Project 1970 - soon to be seen at http://milhouse.treylis.org:81/ __________________ Project1970 - LS1 Swap Complete!

03-29-2002, 01:46 AM	#7
CoryM Registered User Join Date: Dec 1999 Location: Surrey, B.C. , Canada Posts: 874	Explain this to me, most hydraulic clutches are purposly inneffective so that you can actually feel the pedal. On HD equipment with manual clutch the hydraulics are so strong you can't feel the clutch at all. So uh, whats the point of having a hydraulic clutch on a light duty car/truck thats just as hard to push? Yes my 78 3/4 gmc clutch pedal is maybe too much for some people but definatly not worth the effort to convert. BTW if you do convert you can just use almost any master/slave setup with custom brackets. I would not recomend one from newer than about 97, the slaves are plastic and very poorly made. For those who don't know the way hydraulic clutches work is just like the brakes: you press pedal which pushes a piston in the master cylinder which is say 1/2" big which because of Bernallis (sp?) principle causes the slave cylinder with a bigger piston move out with more force (but moves slower). the slaves piston pushes directly on the clutch fork in most applications. Very simple setup, but not nearly as simple as a mechanical linkage . Happy Trucking. CoryM ------------------ 1970 heavy duty C-10 fleetside sport truck. Vancouver B.C. Canada http://www.geocities.com/chevroletc1070 "Take up our quarrel with the foe: To you from failing hands we throw The torch; be yours to hold it high." Lieutenant Colonel John McCrae, Canadian Army __________________ 1970 heavy duty C-10 fleetside sport truck. Vancouver B.C. Canada http://www.geocities.com/chevroletc1070 "Take up our quarrel with the foe: To you from failing hands we throw The torch; be yours to hold it high." Lieutenant Colonel John McCrae, Canadian Army

03-28-2002, 10:10 PM	#3
Fast68Chevy Account Suspended Join Date: May 2000 Location: IL Posts: 0	most likely since the bellhousings, trannies firewalls and such are identical to 10-30 series,. I found the GM description on page 54 of Engine and Clutch section: "Both mechanical and hydraulic clutch controls are utilized. On models using the hydraulic control system, a master cylinder and resrvoir(integral with the brake master cylinder housing) contain hydraulic fluid which is forced through the hydraulkic line when the clutch pedal is depressed. The fluid actuates the slave cylinder which moves the clutch fork, relaeasing the clutch. Releasing the clutch pedal engages the clutch". Pretty uninformative description, but shows hydraulic was used. I know where a 68-70 C60 dumptruck is sitting in a local towing yard gonna be scrapped, hmm... I may grab the doors off it and there isnt much on it that hasnt been abused, i knew the guy it got impounded from, he cant get it back now, poor truck... its huge dumptruck.... I drove it a couple times to clinton landfill to dump it.. the brakes sucked ass and were very scary when loaded down... ------------------ Randy- Lincoln, IL randy@ccaonline.com -71/C-10(thx teeitup and crews!)350 4+4/CH465(thx 71Chev, GMCPaul, and CPNE)longfleet bed(thnx meathead95)!still building it- -'84 Z28 H.O. 305 L69 700R4 GT4 3.73 - 1984 Firebird SE 2.8L T-5 GT4 3.73 -1981 Cutlass Supreme, dunno what im gonna do with it yet... -79 G20 pass van, 350/th350/10bolt *Paint is overrated © RSS Enterprises 2000 [This message has been edited by Fast68Chevy (edited March 28, 2002).]

03-28-2002, 10:12 PM	#4
j-dogg Registered User Join Date: Sep 2000 Location: Texas Posts: 189	I'd sure like a hydro clutch in my truck. My knee gets pretty tired pushing it in all day (I think that should answer your question, Z16).

03-29-2002, 08:03 AM	#8
Huck Senior Member Join Date: Jun 2001 Location: Shelbyville, KY Posts: 3,269	Thought! Chevy changed to Hydro clutch on their trucks--why? I put a 96 chevy truck 5 speed with hydro clutch in my 72. Engagement speed, lockup, leg pressure, all no problem as long as you are not in traffic all day and then a mechanical clutch would be just as big a pain. My 5 speed will give me over 20mpg with a 350, edelbrock, HEI, 308posi. Biggest problem was the firewall linkage and driveshaft length. The slave cylinder is actually built into the throwout bearing assm as there is no clutch release arm!!!! Mounted the clutch master cyl on a plate and fastened it to the firewall- centered from the brake booster. BTW, also have a C5 vette with hydro clutch that is in fact easier to depress and Holds like a raped ape! Chevy didn't go this way for fun--it's cheaper with less parts just like their changeover torsion bar front suspension on 4x4 trucks. JMO------Huck ------------------ 72 Cheyenne, 350, 5spd, LWB, Super trim. 71 GMC JIMMY 4X4 --needs stuff-!

03-29-2002, 10:45 PM	#9
racedvl Account Suspended Join Date: Jan 2000 Location: Woodstock, IL Posts: 7,020	For beating the sh*t out of something, I like the hydro clutch. I find they are usually a little easier to push. But I also like the feel of a manual rod set up as well. I just know that some people were interested in a hydro set-up, and I figured this would be a good way to possibly convert. ------------------ http://hometown.aol.com/racedvl/racedvl69index.html Woodstock,IL.northwest of Chicago It's not what you buy, it's what you build!! I did not climb to the top of the food chain, to become a vegetarian. For some pics of my truck.

03-30-2002, 10:35 AM	#10
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,714	There is nothing inherently wrong with either system, but both are subject to all of the parts that make up the system. Newer trucks have diaphragm pressure plates while at least my Jimmy, has a Borg & Beck 12" pressure plate. I don't find the mechanical clutch to be too difficult, but all of the linkage is subject to wear which changes the geometry and adjustment. I completely rebuil the linkage in my truck and it made a huge difference. I've worked on many hydraulic clutches and the feel is dependent on the pressure plate, the master cylinder diameter and throw, the clutch pedal linkage/pivot ration and the diameter and throw of the slave cylinder. Making an all encompassing statment about the inferiority of hydraulic clutches is like saying hydraulic brakes like accurate feel as well and we should return to mechanical brakes... FYI it is still against the law, technically, to drive barefoot in Texas because mechanical brakes got so hot that you couldn't keep your bare foot on the pedal. ------------------ 70 GMC 3/4 ton Sierra Grande 402/TH400 72 Jimmy 4WD 4spd 4" & 35's 64 Corvette Coupe 68 Camaro 'vert TPI & TH700 69 Z/28 355 12.6's @110 72 Datsun 240Z-ol' reliable __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

03-30-2002, 11:33 AM	#11
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	GM also used a hydraulic clutch in the early 60's light trucks, '60-63 i believe. I wonder if the parts from one of those could interchange to a 67-72. I would like to put a 5spd in my truck, but the hydraulic clutch would be a problem. ------------------ Lucas "Another proud owner of one of the coolest trucks ever built" drop_shift@hotmail.com My Daily-Driver: '72 Chevy LWB Custom/10. Rebuilt 350, 300 HP thanks to a few go-fast goodies. Ochre with a white top. Future plans include a frame off restoration, and maybe a blown 383. __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

03-30-2002, 12:10 PM	#12
Luckymic34 Whisky Bent & Hell Bound Join Date: Apr 2001 Location: Chula Vista, CA Posts: 430	Oooooouuuucccchhhh, Sorry just burnt my foot on my brake pedal. He he he! You might be a redneck if.... ------------------ 68 custom stepside 350 with Carter 650, Weiand intake, HEI, Crane Enegizer 266 cam, Headmen headers 40 series Flowmasters, B&M hole shot 2,000 rmp stall, TCI TH350 Streetfighter, 4.10 gears Virginia Beach, VA by way of Houston, TX __________________ 68 custom stepside PS,PB 350 with Vortec Heads,Carter 650, Edelbrock Performer,HEI, Crane Enegizer 266, Headmen headers 40 series Flowmasters, B&M hole shot 2,000 rmp stall, TCI TH350 Streetfighter, 4.10 gears 2003 Harley Davidson 883C San Diego, CA by way of Houston, TX

03-30-2002, 11:18 PM	#13
racedvl Account Suspended Join Date: Jan 2000 Location: Woodstock, IL Posts: 7,020	LOL!! ------------------ http://hometown.aol.com/racedvl/racedvl69index.html Woodstock,IL.northwest of Chicago It's not what you buy, it's what you build!! I did not climb to the top of the food chain, to become a vegetarian. For some pics of my truck.



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