Vibration
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Junior User
Joined: Dec 2014
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Vibration
Ok need help from the experts. At 50mph and up I have a lot of vibration clutch in or out. 
I know I'm not providing a lot of info but I'm just not sure what else to say about it. Hoping you guys might have the magic fix.
1971 300 6cyl rebuilt did same thing before the rebuild.
I know I'm not providing a lot of info but I'm just not sure what else to say about it. Hoping you guys might have the magic fix.
1971 300 6cyl rebuilt did same thing before the rebuild.
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 83
From: NorCal
You'll need to isolate the source a little further...
Look for a missing wheel weight, loose lugs, or a zip-tied a wrench attached your driveshaft, etc.
Check for loose nuts, bolts, or worn suspension & steering components.
Try rotating your tires.
Look for a missing wheel weight, loose lugs, or a zip-tied a wrench attached your driveshaft, etc.
Check for loose nuts, bolts, or worn suspension & steering components.
Try rotating your tires.
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Junior User
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Is there any way to tell for sure which flywheel I have? The only thing I remember about it when I had it out was it had balance holes drilled in it.
Also what is sb?
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Junior User
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Ok it didn't have balance weights. I feel like it is the right flywheel. Thanks for the help.
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Lead Driver
Joined: Apr 2011
Posts: 6,399
Likes: 40
From: El Dorado, Arkansas
A good while back. I had a vibration problem with my truck ('69 F100, 240, C-4) starting at about 35 MPH and up.
It turned out to be the drive shaft U-joints. Many of the needle bearings in the U-joint cups were either broken or ground up into metallic dust!
After I replaced both drive shaft joints, the vibration problem on my truck went away.
It turned out to be the drive shaft U-joints. Many of the needle bearings in the U-joint cups were either broken or ground up into metallic dust!
After I replaced both drive shaft joints, the vibration problem on my truck went away.
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Fleet Owner
Joined: Dec 2009
Posts: 20,678
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From: NorCal
Be prepared to scoot when your pal discovers what you've done.
Please post back your corrective action for filing in "the knowledge base".
Thread Starter
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Junior User
Joined: Dec 2014
Posts: 77
Likes: 0
A good while back. I had a vibration problem with my truck ('69 F100, 240, C-4) starting at about 35 MPH and up.
It turned out to be the drive shaft U-joints. Many of the needle bearings in the U-joint cups were either broken or ground up into metallic dust!
After I replaced both drive shaft joints, the vibration problem on my truck went away.
It turned out to be the drive shaft U-joints. Many of the needle bearings in the U-joint cups were either broken or ground up into metallic dust!
After I replaced both drive shaft joints, the vibration problem on my truck went away.
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Junior User
Joined: Dec 2014
Posts: 77
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Well I decided to put the back end on blocks and watch things while turning. It turns out the drive shaft has a pretty good bend in it that became more obvious the higher the speed.
Any ideas on where to find a drive-shaft that will fit a 1971 short bed?
Any ideas on where to find a drive-shaft that will fit a 1971 short bed?
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 83
From: NorCal
Craigslist, salvage yard, FTE market place, or try your state FTE chapter. Or have one made.
You're in Texas, right? Isn't there like bazillion trucks in Texas??
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
C5TZ-6375-N .. Flywheel - 164T Ring Gear - Use with 11" clutch / (6) 5/16" -18 pressure plate attaching holes on a 12 3/8" bolt circle.
Applications: 1965/66 F100/250 240/300 I-6 2WD - 1967/74 F100/250 240/300 I-6 2WD/4WD & F350 - 1975/76 F100/250 300 I-6 2WD/4WD & F350.
240 I-6 cancelled at the end of the 1974 model run.
Applications: 1965/66 F100/250 240/300 I-6 2WD - 1967/74 F100/250 240/300 I-6 2WD/4WD & F350 - 1975/76 F100/250 300 I-6 2WD/4WD & F350.
240 I-6 cancelled at the end of the 1974 model run.
Thread Starter
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Junior User
Joined: Dec 2014
Posts: 77
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C5TZ-6375-N .. Flywheel - 164T Ring Gear - Use with 11" clutch / (6) 5/16" -18 pressure plate attaching holes on a 12 3/8" bolt circle.
Applications: 1965/66 F100/250 240/300 I-6 2WD - 1967/74 F100/250 240/300 I-6 2WD/4WD & F350 - 1975/76 F100/250 300 I-6 2WD/4WD & F350.
240 I-6 cancelled at the end of the 1974 model run.
Applications: 1965/66 F100/250 240/300 I-6 2WD - 1967/74 F100/250 240/300 I-6 2WD/4WD & F350 - 1975/76 F100/250 300 I-6 2WD/4WD & F350.
240 I-6 cancelled at the end of the 1974 model run.
Senior User
Joined: Feb 2013
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From: Southern Cal Desert
You know, if its not your DS, take a long look and feel your tires. One or more may be separating on you and it will do the same thing before it blows. Desert heat and Texas heat seem to do this a lot.