3.9 5R55S/W Converter Vibration FIXED

3.9 5R55S/W Converter Vibration FIXED

Postby aapple » Thu Sep 17, 2015 3:35 pm

Anyone know of an inherent issue with the 3.9(specifically) engine, 8 lug converter, using this trans having a severe vibration at 2000rpms? Our converter builder just told me Sonnax has a new front cover that eliminates the "adapter" plate/ring, allowing the converter to bolt directly to the flexplate....to eliminate a problem with vibrations for this engine ONLY. Sure would have been nice to know that BEFORE the 4th dang converter install....
Just curious. Nothing on the Sonnax website about it that I can find.
This is in a 2002 Thunderturd, btw.
J. Adams
Duncanville, Texas


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Re: 3.9 5R55S/W Converter Vibration

Postby dhritsko » Thu Sep 17, 2015 4:39 pm

I know there is an alignment tool for the adapter plate and Adapt a Case and others make it . I f you don't use it you could get vibrations , the tool centers off of the pilot
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Re: 3.9 5R55S/W Converter Vibration

Postby aapple » Thu Sep 17, 2015 6:20 pm

Not the issue. I have the alignment tool. There is supposed to be something specific to the 3.9 engine, with the 8 lug converter. Could be the converter guy is blowin smoke up my patootie, for all I know. ;>)
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Re: 3.9 5R55S/W Converter Vibration

Postby dhritsko » Fri Sep 18, 2015 8:23 am

I sent this to the plant to see what they say
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Re: 3.9 5R55S/W Converter Vibration

Postby dhritsko » Fri Sep 18, 2015 10:05 am

Our converter tech is not aware of any front cover . He said if you would like to speak with him give me your number and he will call . Larry is a good dude and has been doing this for years , he was also a trans builder in his past life .
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Re: 3.9 5R55S/W Converter Vibration

Postby aapple » Fri Sep 18, 2015 10:54 am

That's ok Dave....I'm sure it's just s snow-job on the part of our converter guy. Thanks anyway! :>)
J. Adams
Duncanville, Texas


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Re: 3.9 5R55S/W Converter Vibration

Postby zzyzxpat » Fri Sep 18, 2015 10:57 am

I wonder if this is what your guy meant,

http://www.sonnax.com/parts/622
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Re: 3.9 5R55S/W Converter Vibration

Postby dhritsko » Fri Sep 18, 2015 11:06 am

That is what I was thinking Pat but that is for noises not vibrations
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Re: 3.9 5R55S/W Converter Vibration

Postby aapple » Fri Sep 18, 2015 6:19 pm

Naw....he said it was the front cover itself. Allowed you to bolt the converter directly to the flexplate, instead of having to bolt the converter to the adapter plate, and then to the flexplate. I think the guy was just talking doo-doo, instead of owning up to their screwup on that last converter. This car dint have a vibration before we installed that converter. I think they got it welded crooked, and just don't wanna admit it.
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Re: 3.9 5R55S/W Converter Vibration

Postby aapple » Wed Sep 23, 2015 4:04 pm

This one is out the door, with a Recon converter... :>)
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