5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

.Vibration

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Old 02-26-2007, 12:39 AM
  #1  
project347
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Default .Vibration

just built my 347 up and dropped it in. started it up and held it at about 1800 rpm for 10 minutes. after that i reved a couple times id say between 6-8k everything seemed fine. I took her out on the road takin it easy shifting about 4k. so heres the problem..... around 4k it wants to vibrate quite a bit, Im thinking it may be my harmonic balancer(it looked a lil messed up). I talked to the guys I had balance averything and it was balanced to the 28oz harmonic and stock flywheel so all thats good. has anyone had this vibration after a build up?
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Old 02-26-2007, 12:45 AM
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89 fox
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Default RE: .Vibration

turn the driveshaft 90*....sometimes if it doesn't go back on the way it comes off...it will cause a vibration
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Old 02-26-2007, 12:49 AM
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AdderMk2
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Default RE: .Vibration

WHOA.. wait a second......
I talked to the guys I had balance averything and it was balanced to the 28oz harmonic and stock flywheel so all thats good. has anyone had this vibration after a build up?
this cant be right, Your car takes a 50oz imbalnce both front and rear, not 28oz front and 50oz rear... something tells me they screwed up. If your using your stock balancer, your not using a 28oz, but a 50oz... which they claimed to have used a 28oz

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Old 02-28-2007, 11:17 PM
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project347
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Default RE: .Vibration

ok talked to the guys again they said they used 28oz balancer and flywheel....so stock harmonic and flywheel are 50 oz?
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Old 02-28-2007, 11:47 PM
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Default RE: .Vibration

Yep, your stock balancer and flywheel are 50oz. Time to buy a 28oz balancer and flywheel.
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