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Vibration from 4800+ Rpms

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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 from 4800+ Rpms

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Old 08-20-2008, 08:46 PM
  #1  
projectresto83
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Default Vibration from 4800+ Rpms

After I swapped my trans out from the c5 to the c4 I have had this vibration that vibrates the hell out of the trans area. It has a new flywheel with the correct balance along with a new balancer(a few months old but in perfect shape). I also replaced the U joints in the driveshaft not to long before the swap. I bought the flexplate from a shop on ebay so I am guessing that is what is causing my problem. It does perfectly fine at all other rpm's. It just doesn't like the higher rpms so I shift at about 5,000 bc of it.I hear it more in the back have of the motor area to while revving it up. Another reason why I figure its the flexplate. I do need to replace the motor and tranny mounts but I never had a problem from the other flexplate/tranny combo.

And no I can't switch back to the other plate because one is a 164 tooth and one is 157 do to the bellhousing sizes.

Do you guys agree in thinking its the flexplate?
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Old 08-20-2008, 11:03 PM
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mjr46
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it could be, without seeing the balance weight on the back of it it's hard to guess and be right
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Old 08-21-2008, 08:27 AM
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I wish I had a pic of the flexplate. I thought something looked a little off when I got it but I wasn't sure and the sticker on the plate with the info about it said it was the 28 oz. The weight looked a little bit bigger than the weight on my old plate. Ooo well. When I move up to a 5 speed after my next tour in Iraq I will be changing it again anyway. Along with a 351 so I don't have to worry about the off balance screwin up the motor either lol. Ill run it till she blows!
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