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Old 04-10-2013, 05:44 PM   #1
AndrewSeib
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Location: Princeton, IN
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Stiff clutch 72

No slip runs and drives great. shifts as it should, but the clutch is extremely heavy. My main concern is my grandma is begging me to drive it because she had one in her younger (more limber) days, and I highly doubt she could manage to apply the clutch as it is. Any suggestions to loosen it up a bit?
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Old 04-10-2013, 08:04 PM   #2
68gmsee
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Re: Stiff clutch 72

A few possiblities.

Throw out bearing shaft needs lubricating. Also, a worn pressure plate or maybe
heavy duty clutc/pressure plate installed on the truck. I had this on my 69. It was very hard to push so I bought a non heavy duty pressure plate and clutch and made a lot of difference.
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68 GMC 250/3 speed Saginaw p/b p/s
69 Chevy 350/350 currently in pieces still lookin for a cab
06 Trailblazer
I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive...
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Old 04-10-2013, 08:13 PM   #3
AndrewSeib
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Re: Stiff clutch 72

Thanks man!
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Old 04-10-2013, 09:18 PM   #4
68gmsee
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Re: Stiff clutch 72

On second thought, you may not want grandma to drive it..
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68 GMC 250/3 speed Saginaw p/b p/s
69 Chevy 350/350 currently in pieces still lookin for a cab
06 Trailblazer
I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive...
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Old 04-11-2013, 12:46 AM   #5
AndrewSeib
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Re: Stiff clutch 72

Oh its okay, better now than after the rebuild! she can't do too much damage at this point haha so I'll let her have her fun before I sink a lot of time and money into my baby! :p
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Old 04-11-2013, 01:39 AM   #6
Rufton
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Re: Stiff clutch 72

Sometimes the 3 finger pressure plates get very stiff.
Even a new 3 finger is stiffer than a typical diaphragm pressure plate.
I put non-performance diaphragm pressure plate from autozone on 66 and pedal is much easier and smother.

I also replaced linkage bushings w/ bronze.
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Old 04-11-2013, 02:28 PM   #7
AndrewSeib
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Re: Stiff clutch 72

Thanks for the advice! I'll look into these things!
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Old 04-11-2013, 02:47 PM   #8
Rufton
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Re: Stiff clutch 72

Autozone part number nu551 contains diaphragm pressure plate that fit 66 it also contains a clutch but that didn't fit 66. just compare to OEM before install.
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