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help with 351m

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Old Jan 1, 2012 | 10:06 AM
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joemc
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help with 351m

I just changed the flexplate on my 79 ford. Once i got it back together there's a vibration. Thinking i may have installed the wrong flexplate. The napa dealer showed only one but i've read that there are actually 3 different flexplates for the 351m.
I was also told the 351m is internally balanced. Does that mean there is no counter weight on the flexplate?
Any ideas what else may cause the vibration? Everything went back together ok, and I'm pretty confident the torque converter was seated.
 
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Old Jan 1, 2012 | 10:54 AM
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mark a.
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A 351M is external balanced & no matter the part number the weight is the same. I'd tear it back apart and put a different one on if it didn't shake before you took it apart.
 
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Old Jan 2, 2012 | 08:18 AM
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Thanks Mark. Since it's externally balanced I guess that means the flexplate has to go on the crank the same way it came off. I didn't mark the crank so it's probably on in a different position. Any tips how to get it back right other than guessing?
 
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