Excessive Rattling/Vibration
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Laughing Gas
Joined: Oct 2007
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Excessive Rattling/Vibration
I realize that my truck is nearly half a century old, but I still feel that the cab shakes/vibrates excessively. Should I replace the cab mounts? How do I tell if they're worn out? Or might it be the motor mounts?
Thanks guys.
EDIT: Its fine in 1st and 2nd gear, but once I get up there in 3rd, it gets pretty bad.
Thanks guys.
EDIT: Its fine in 1st and 2nd gear, but once I get up there in 3rd, it gets pretty bad.
Senior User
Joined: Feb 2008
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You have a 2-piece drive shaft and ,where the 2 halves join, there is a bracket mounted to the underside of the frame that contains a bearing suspended in a rubber bushing. That is your carrier bearing. very easy to get and to change.
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Laughing Gas
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Posting Guru
Joined: Dec 2000
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From: San Diego CA
Matt does it vibrate at the same speed every time. That would indicate a drive train or a wheel balance problem. Jack up the rear tires put it on jackstands and have a helper run it at the vibration speed. If it doesn't vibrate then it's most likely a front wheel out of balance. If it does, see if it is a tire shaking or the driveshaft shaking. Check for bent wheels, abnormal tire conditions(not round), loose Ujoints, bent drive shaft, play in tailshaft or pinion bearings.
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Laughing Gas
Joined: Oct 2007
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Yeah, it vibrates at about the same speed. It doesn't just randomly began shaking, if that's what you are saying.
It could be a bent wheel, but I'm suspecting a universal joint... I will try your suggestion of blocking up the wheels and reduplicate the gear and speed at which I feel the vibration.
Thanks guys.
It could be a bent wheel, but I'm suspecting a universal joint... I will try your suggestion of blocking up the wheels and reduplicate the gear and speed at which I feel the vibration.
Thanks guys.
Postmaster
Joined: Mar 2004
Posts: 4,375
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From: seattle
with the rear end in the air and on stands run the truck, but before you 'go driving'; hold the foot on the brake and put it in reverse and forward a few times...a bad U-Joint is a huge clunking sound usually...It can also sound as if its sqeaking/squealing in early stages.
If after this its not clunking run it with a helper inside and I would go and look at the drivetrain in motion...a bent driveshaft will be pretty obvious if its the case...if it has a dent in it thats a shaft in need of replacement.
Let us know how things turn out.
- cs65
If after this its not clunking run it with a helper inside and I would go and look at the drivetrain in motion...a bent driveshaft will be pretty obvious if its the case...if it has a dent in it thats a shaft in need of replacement.
Let us know how things turn out.
- cs65
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Laughing Gas
Joined: Oct 2007
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That's great advice, cs65. Funny you mention clunking and squealing, because sometimes when I really give it gas and drop the clutch hard, I do hear a pretty go clunk come from near the differential, which I suspect would be the u-joint.
I'll keep you guys updated on the issue, after I run it up on stands to diagnose everything.
Let's hope the truck doesn't fall off the stands while we're spinning the crap out of it!
I'll keep you guys updated on the issue, after I run it up on stands to diagnose everything.
Let's hope the truck doesn't fall off the stands while we're spinning the crap out of it!
Posting Guru
Joined: Dec 2000
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From: San Diego CA
Do a hand shakedown on the jackstands before running it up to speed. That means put it on the stands then crawl under with the trans in neatral and wiggle, shake, and rotate, anything the moves while driving. You'll probably find it before ever starting it.
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Laughing Gas
Joined: Oct 2007
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HOLY CRAP
All I did was replace the universal joint and ALL of my problems went away. A $10 u-joint fixed all the rattling, vibrating, shaking, and banging noises. The clunking noise also ceased.
I took the truck up to 60 mph and it was beautiful!! When I disengaged the clutch, I swear everything shut off, I was just coasting super smoothly, no sounds and vibrations, besides the tires rolling along the road.
Awesome!
All I did was replace the universal joint and ALL of my problems went away. A $10 u-joint fixed all the rattling, vibrating, shaking, and banging noises. The clunking noise also ceased.
I took the truck up to 60 mph and it was beautiful!! When I disengaged the clutch, I swear everything shut off, I was just coasting super smoothly, no sounds and vibrations, besides the tires rolling along the road.
Awesome!