No clutch all of a sudden

Discussion in 'General GM Discussions' started by Tomcatx5, Dec 6, 2017.

  1. Tomcatx5

    Tomcatx5 New Member

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    I have a '03 gmc Sierra 1500 w/4.3 & 5 speed w/215,000 miles. One minute driving & shifting great to super hard to shift w/basically no clutch. With clutch on the floor when i come to a stop it stalls out. If I start it in gear w/clutch fully depressed it takes off like an old truck would before a safety switches. Prior to this happening there were no warning signs such as noise or slipping. There is still plenty of fluid in the reservoir, plenty of pedal, just no clutch. I was hoping it was the slave cylinder but no leaks. My friend (mechanic) got underneath & watched as i pressed in the clutch & everything is working as it should as far as he could tell. Any ideas or is it time for a clutch? I just assumed it would give me some warning signs but it didn't. All good one minute to all bad the next. Any help would be greatly appreciated.
     
  2. barrrf

    barrrf Website QC

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    Throw out bearing

    Why didnt your friend the mechanic fix it? Since he is a mechanic and all.
     
  3. kids-at-711

    kids-at-711 Sexually identifies as a shopping cart.

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    Agree with Bart, get the full clutch kit, machine the flywheel too.
     
  4. Tomcatx5

    Tomcatx5 New Member

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    Because it was 3 in the morning & 20 degrees. He thinks clutch plates are warped but i dont know. Thats why I'm on here asking. He said throw ut bearing is working as it should as far as he can tell
     
  5. NoStopN

    NoStopN Rusty Hinges, porn star

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    Sounds like your mechanic friend needs more time wrenching & less time looking. The most likely culprit is a bad slave (clutch release) cylinder. If it goes bad, the clutch release fork won't get fluid pressure to release the throwout bearing & won't release the clutch. Let your mechanic friend check it out before just throwing money & parts at it.
     
  6. Bushwacker

    Bushwacker GMFS Member

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    It's your slave cylinder not your clutch or throw out bearing

    Sent from my HTC One_M8 using Tapatalk
     
  7. barrrf

    barrrf Website QC

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    clutch slave bearing check for leakage
     
  8. kids-at-711

    kids-at-711 Sexually identifies as a shopping cart.

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    :facepalm:
     
  9. Tomcatx5

    Tomcatx5 New Member

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    Where would it be leaving from? Should I be able to see fluid from underneath the truck?
     
  10. NoStopN

    NoStopN Rusty Hinges, porn star

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    If there is actual leakage under the truck, then it could be a leak in the hydraulic part of the system. But, based upon your description, it sounds like the slave cylinder has just gone out. This is a picture of a slave cylinder.

    [​IMG]
     
  11. kids-at-711

    kids-at-711 Sexually identifies as a shopping cart.

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    Depending on his definition of "plenty of pedal" the slave should be ok. By his description tho it sounds like a disc failure.
     
  12. ScottZ71Lyfe

    ScottZ71Lyfe I Have Been Called Scottdawg420 Before

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    Just let your mechanic friend tear it apart instead of listening to guys on the internet.
     
  13. Phildirt

    Phildirt n. fil-dert.

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    Scott is getting smarter.
     
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  14. NoStopN

    NoStopN Rusty Hinges, porn star

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    I would think if the clutch itself has failed (or material on the disc is gone/wet), it wouldn't clamp & therefore wouldn't move. His description of "it moves like an old truck before safety switches" sounds like the slave won't uncouple the clutch from the pressure plate. I don't have a damn clue what "plenty of pedal" would even mean. With hydraulic assistance, the pedal will most likely feel the same whether the clutch/slave are working properly or one has gone bad.

    We tried to tell him, but it was too cold.
     
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