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Gotta be a bad rebuild. I've done everything imaginable.

I had the trans pulled and the converter spun to see if it was out of balance. Mechanic said it was off 40 grams. He added a weight to sync it. Now have vibration only at about 2500 to 3000 rpms but still bugs the crap out of me.

yep, did that. The main pulley is a little bent and wobbles a tiny bit. Need to find a new pully or a used perfect one.

Well theres only a little vibration left. I was finally told today that it may be the slightly bent crank pully. Since mine wobbles a little bit and it's attached to the Harmonic Balancer a fabo member I met today thinks it's definately a problem. We'll see next week. Because it's being replaced...

Believe me. We have checked everything out twice. Everything is new. Correct non-weighted front balancer. The crank pully is a little bent but don't know if that would cause vibration. Just adding the second weight on that torque converter made a huge difference. Used to vibrate from 1000 to...

May have had a 360 in it at some point because there were indeed weights on the TQ.

I hear ya but that's what the trans guy said. Said there was one weight on it and when he spun the converter it was 40 grams off. He put another counterweight next to it and it's much better. The second weight was put right next to the existing one.

Had the trans pulled and the TQ spun and checked. TQ was 40 grams off so they added another weight right next to the one there already to zero it out. Only have vibration up to 2000 rpms and really not too bad. There's still a little vibration left and all we can see is that the main crank pully...

Welcome to the vibration club. Mine does it in park. I'm down to the last thing, converter or flex plate.

Well I have done everything but pull the trans on the problem. Just sitting there and giving it gas makes it vibrate. Either the guys rebuilt the motor unbalanced or theres a TC problem. Although when I stand above the motor and give it gas by hand, the motor looks and sounds smooth. would a...

Well I had Cuda Mark look at it and he said the harmonic balancer looked ok and we really couldnt see the TC but noticed the dual exaust I had put on was pretty ridgid. The hangers have rubber washers but it's still very ridgid so I was told to put rubber hangers on them anyway. If that doesnt...

I don't know the history of what trans is in the car or what converter. I had the motor rebuilt, new mounts all around, new (hanging) exaust system and this still vibrates. It's either the converter, balancer, cam or the engine itself. It's not a huge vibration but it's there. I am in Oceanside...

So I bought this 74 Dart. Rattled like crazy on the drive home. I had the engine rebuilt, front end rebuilt, new shocks, New engine mounts and trans mount, alignment, new carb and this STILL vibrates with acceleration!!!! This is driving me nuts! I take it out at about 50-60 mph and then throw...