Shudder while taking off

iamtherealJayy

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1978 Chevrolet K10 350/SM465/NP205. I’m going to start with saying this truck is my work truck and it has a utility bed on it mostly full of all my tools. The truck had an issue a while back where you literally could not take off in first it would shake so bad similar to a wheel hop feeling, so I started using low to take off. After a few weeks I couldn’t take off in low either. Replaced motor mounts(cooked lol) it’s somewhat better, I can take off in first if it’s perfectly level or down hill, but if there’s any resistance taking off it still shudders. Could this be some other mount somewhere? The transfer case looks solid nothing appears loose. Could this be in my clutch? There’s a loud obnoxious squealing noise while the pedal is pressed. I’m not positive where the engagement of the pedal needs to be since this is my only mechanical clutch truck(other is hydraulic) I currently have it adjusted to as close to the floor as possible since I prefer it to start moving when I start letting off(probably a good 2” off floor before it grabs) but it does grab almost all at once, there is nothing smooth about taking off in this truck. Will provide photos of anything requested.
 

bucket

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Clutch chatter. Plan on replacing the clutch, pressure plate, throw out bearing (likely the source of the squeal) and resurfacing the flywheel too. If the flywheel feels fairly smooth and doesn't have any terrible hot spots, you can get away with doing a "home resurface" using a **** wheel on an angle grinder or 80 Grit sandpaper on a DA sander. Well... that's only if using a quality clutch kit I should say. Some of the really cheap clutch kits have a tendency to chatter even on a brand new flywheel.
 

fast 99

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Noise when clutch depressed is likely the TO bearing, shutter would suspect there are hot spots on flywheel, disc is flat, or disc springs are broken / loose or oil on clutch.

Any of these could cause what you describe.

When new, clutch discs are wavy with high and low areas.
 

bucket

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Edit: W H I Z wheel...

Really?! We can't even say ****?! @HotRodPC there's another stupid one to remove from the list.
 
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iamtherealJayy

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I wouldn’t doubt oil being on the flywheel, I really need to pull everything apart and reseal the engine/trans/tcase, they all leak. Inside the bell housing is disgusting(inspection plate missing and part has been cut off for some reason). Is there anything crazy or anything specific to watch for when changing a clutch? I figure it needs replaced this is my highest mileage truck lol it’s the only one with wear on the pedals.
 

Radiohead

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Might as well put an eyeball towards transmission/transfer case mounts too. They're most likely old too.
 

HotRodPC

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Edit: W H I Z wheel...

Really?! We can't even say ****?! @HotRodPC there's another stupid one to remove from the list.
What word is it? Figure out a way to get it to me. Surely it's not ****.
 

HotRodPC

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What word is it? Figure out a way to get it to me. Surely it's not ****.
sunuvbich it is WH1Z. I guess we'll have to use a 1 until I get on the home computer and get in there are change it. I thought I got most of those done, but I didn't make it to the W's yet. I think I made it to P or so or maybe even R. But when I get in there again....
 

fast 99

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I wouldn’t doubt oil being on the flywheel, I really need to pull everything apart and reseal the engine/trans/tcase, they all leak. Inside the bell housing is disgusting(inspection plate missing and part has been cut off for some reason). Is there anything crazy or anything specific to watch for when changing a clutch? I figure it needs replaced this is my highest mileage truck lol it’s the only one with wear on the pedals.
Front bearing retainer wear, fork wear, ect. Be sure to get the flywheel turned, bolt the pressure plate down evenly.
 

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