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Vibration in clutch pedal

Discussion in 'Manual Transmission & Clutch' started by Lu Blunt, Sep 26, 2017.

  1. Lu Blunt

    Lu Blunt Full Access Member

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    recently had the clutch replaced in my 79 k30 350/sm465/np205. The wrong size throw out bearing had been used and destroyed the clutch n the front snout of the trans. All was fixed. Drove fine the first 50 miles or so then the vibration started growing. Drove it another 50miles back to my mechanic. The vibration is a lot worse at higher rpm. It feels like ur running over the rhythms on the side of the highway. Like a hard pulsing vibration can be felt in the steering wheel and especially the clutch pedal. No noticeable vibration from trans shifter or tcase shifter. Truck shifts great. It's like it right between my feet or right behind the engine. I took it the mechanic immediately thinking there was a problem with the new clutch n didn't want to ruin it. Been at the mechanics a month now he's tried everything he can think of but the vibration is still there. I told him it never did this type of vibration before the clutch work. He's having a trans tcase specialist come look at the truck. I feel like it's clutch related n I'm about out of patience. Spent the last month haulin firewood in my daily driver instead of the work truck. He's an old family friend n wouldn't do me wrong but shit happens. U guys have any ideas as to the problem ?
     
  2. CSFJ

    CSFJ ----------------- Supporting Member

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    Bolts still tight in the flywheel? And did they resurface your original or replace it? If they replaced it, is it verified to be the correct one? The 400 had a counter weighted flywheel, both will bolt up iirc.
     
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  3. Lu Blunt

    Lu Blunt Full Access Member

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    I mentioned the fly wheel n he said it was resurfaced. After having a transmission builder drive the truck they decided on the rear drive shaft as the cause of vibration. It will be rebalanced on Monday. Should I consider a one piece aluminum rear drive shaft?
     
  4. bucket

    bucket Super Moderator Staff Member

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    Doesn't sound like the symptoms of a prop shaft. That would be speed related, rather than engine rpm related. You also would feel it in the shifter.
     
  5. Lu Blunt

    Lu Blunt Full Access Member

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    I agree. I think it’s something to do with the recent clutch job. It did not do this before the new clutch. The vibration didn’t feel like it was coming from behind the transfer case, I felt it right behind the engine. Plus I have had front drive shaft rebuilt n new ujoints in the rear drive shaft and that was bearly over a year ago
     
  6. bigcountry78

    bigcountry78 Full Access Member

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    Did you ever find out what was going on? I’m having some of the same issues.
     
  7. Lu Blunt

    Lu Blunt Full Access Member

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    No luck yet. Been driving the truck pretty regularly since the new clutch. Kept thinking the vibration was the clutch assembly or possibly the clutch arm return spring. Found a decent return spring to replace the broken one. Helped alittle. Found if I hold the clutch pedal like an inch or two down (not enough to engage it) I can keep the vibration to a minimum. Drove like that for 5k miles or more. Recently the vibration has gotten so bad I can barely drive it. Looks like the trucks headed back to the shop. Not sure what else to do.
     
  8. bucket

    bucket Super Moderator Staff Member

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    Sounds like it's been a clutch problem this whole time.
     
  9. dvdswan

    dvdswan Full Access Member

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    New parts can be bad. Has the new pressure plate been placed on a lathe to check for vibrations or warping? I would think if the clutch disc was missing any material you would see it. Was the pilot bushing replaced?
     
  10. B.K. Cunningham

    B.K. Cunningham Full Access Member

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    Input shaft bearing retainer. 25 bucks. Mine was rubbing and off center. Pedal was doing the same thing, push in a inch and it would quit for a while. Finally broke, I thought it was the clutch too.

    Input bearing retainer.jpg
     
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  11. Lu Blunt

    Lu Blunt Full Access Member

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    Not sure if the pressure plate was checked for vibrations. Also not sure about the pilot bushing. I will have the input shaft bearing retainer replaced when everything is apart. Hopefully have the truck in the shop this next week
     
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