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Old 11-09-2008, 07:38 PM   #1
allen123
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Weird and Loud vibration please help

Ok my truck has a really loud and annoying vibration when i get my truck at about 2500 rpms and stops at 4000 rpms. Its not my tire balance or alignment cause it does it when it's in park revving it up. I replaced my rear U-joint but not my front so it might be that or Someone said it could be my flywheel.
Anybody else having this?
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Last edited by allen123; 11-09-2008 at 07:39 PM.
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Old 11-09-2008, 07:42 PM   #2
roughedup72
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Re: Weird and Loud vibration please help

Flywheel, bent fan blade, or harmonic balancer
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Old 11-09-2008, 07:43 PM   #3
1968SWBBigBlock
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Re: Weird and Loud vibration please help

2nd all the above
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Old 11-09-2008, 07:45 PM   #4
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Re: Weird and Loud vibration please help

if you're stopped and it's doing it, it's not the ujoints. If its a flywheel it will sound like a rod knocking. Could be a harmonic balancer.
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Old 11-09-2008, 07:50 PM   #5
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Re: Weird and Loud vibration please help

alright thanks
I already replaced the harmonic balancer
It could be the fan blade cause its pretty roughed up
But im not sure if it would make that big of a vibration cause its a pretty rough vibration
And its been doing it since i got the truck and my flywheel just started clicking like that yesterday
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Old 11-09-2008, 07:57 PM   #6
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Re: Weird and Loud vibration please help

what engine does it have?
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Old 11-09-2008, 08:02 PM   #7
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Re: Weird and Loud vibration please help

350/350
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Old 11-09-2008, 11:12 PM   #8
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Re: Weird and Loud vibration please help

check the flywheel for cracks and convertor bolts
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Old 11-09-2008, 11:28 PM   #9
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Re: Weird and Loud vibration please help

Ok thanks
Well took the fan off earlier to see if it was it and its not the fan, So i guess it leaves it to the flywheel my dad is going to be home tomorrow so we'll prob take it off and look at it.
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Old 11-11-2008, 09:37 AM   #10
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Re: Weird and Loud vibration please help

did this just start? Did it start after changing anything? I had the same problem and did all the same things you did. It was the flywheel. Is it a 400 flywheel? Have you lowered or altered stance and changed pinion angle? Again the big ? is when did it start. Gary
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Old 11-11-2008, 12:10 PM   #11
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Re: Weird and Loud vibration please help

Quote:
Originally Posted by acl View Post
did this just start? Did it start after changing anything? I had the same problem and did all the same things you did. It was the flywheel. Is it a 400 flywheel? Have you lowered or altered stance and changed pinion angle? Again the big ? is when did it start. Gary
It's been doing it since i got the truck in april.
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Old 11-11-2008, 09:40 AM   #12
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Re: Weird and Loud vibration please help

does it shudder at any speed. I bet it is the flywheel, cracked or not a 350 flywheel
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Old 11-11-2008, 10:35 AM   #13
truckdude239
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Re: Weird and Loud vibration please help

Quote:
Originally Posted by allen123 View Post
. Its not my tire balance or alignment cause it does it when it's in park revving it up.
Anybody else having this?
that right there tells you it is not a u joint because in park your drive shaft is not spinning
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Old 11-11-2008, 12:01 PM   #14
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Re: Weird and Loud vibration please help

I third (or fourth?) the flexplate. They crack, they warp in high temps, the bolts take a huge beating every day. If it's at particular rpm, it's likely not crank/rod/pistons. So you only have balancer/pulleys/fan/flexplate left...
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