those couplings aren't the most precision things around, you could replace it with a new one and not get a bit better. If everything checks out, just keep running it. remeber, 4 cylinders can't be completly balanced without a balance shaft. The big 224 cu in motor of yours can shake your fillings out when everything is perfect. Just thought of one other thing, are you having any charging problems? I've seen the magnets in the balancer slide around and cause problems, it could throw the balance off. Whenever I change one out to an altenator, I allway knock the magnets out berfore replacing the balancer
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