Match balance a 390 flywheel

I thought about that, but the guy who's attached to the Ebay account is Tim Magdaz. Since I have to pull the trans out anyways I was going to pull the motor and pan to look for mallory. I'll just go from there with whatever I see. It's a combination of getting tired of throwing money and time at this project. So if I see anything negative It's just going to sit for another couple years. When I was younger I'd probably hound dog this, but this car isn't high on the list of project cars, and unlike a lot of users on here I'm not 100% devoted to AMC. I have 2 C10s, a 55 Tbird, 55 Dodge, this Javelin, and my XJ. That's a lot of information to juggle. So retard comments from the peanut gallery show a lack of professionalism or knowledge on the subject. Just another troll that needs to be taken out back, not talking about you. 

Deans69 wrote: For those who actually have knowledge to pass on and offered advice I appreciate it. For the rest, thanks for reminding me how this hobby attracts a lot of cockroaches. Aaron Kaufman, Tony Z and Andre down here in San Antonio have reached out to help so I think between the 4 of us we can come up with a solution. Funny, they all said the same thing, stay off the forums, lol.

Just don't underestimate the impact of the flywheel or flexplate being even a tick off balance.  The original flexplate on my 290 got a crack in the ring gear.  Just the tiny space from the crack threw the balance off enough that a vibration would start just under 40mph and increase to a hard shake by the time it got to 55mph.  There was no other indication of the crack, zero symptoms or issues starting, shifting, driving.  The flex was replaced with a proper used one and the issue disappeared immediately...without doing any balancing on it. 

Well, given that "Aaron Kaufman, Tony Z and Andre down here in San Antonio have reached out to help so I think between the 4 of us we can come up with a solution.", I will be extremely interested in what "solution" they come up with that hasn't already been mentioned in this thread.  There are only so many ways to skin this cat and I think all of them have been covered.  But what do I know.  Been doing this for over 50 years and am only a cockroach. 

But I have a prediction, when the solution is found, and it is one that has already been covered in this thread, the OP will never post it.  He won't be able to admit that some of us were right all along.