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Looked it up...... There is indeed a separate plate the converter bolts to..... At least, there should be...... Have a look here.
I believe there is some confusion with terminology, in my opinion almost no automatic transmission has a flywheel, the ring gear he may be referring to for the starter being mounted to the converter, and then your flex plate is bolted to the crank and yes most of time the ring gear is fitted to the converter and not the flex plate, I would guess due to the strength of the converter assembly vs the thin steel of a flex plate, most of its strength comes from being bolted to the converter.
I see that the spec for the Converter to flexplate is 270 in lbs about 22.5 ft lbs. Is that correct? what if he didn't torque them correctly and just impacted them on? Could this cause the vibrations I'm getting? Also should there be lock tight on this bolts? Seems like a very low torque spec but if so could the flex plate have been damaged from over torqued bolts?
After all was said and done, it was the Jasper transmission that was the cause of the vibration. The shop that did the transmission to start with said they replaced the converter and than installed another transmission (that I didn't believe). So I was just getting smoke blown up my a$$ by this first shop, and wasn't getting anywhere with him. So I decided to bring it to a different shop and reluctantly Jasper sent out a third unit (still don't think the second one was install to begin with). The unit was installed and big red is back in business running well with no vibration!!!!