Hi Brad,I had a similar problem with my 99.Only in my instance the crankshaft as well as the balancer was worn. I had the engine down and had it repaired and re machined but this is a bit drastic. if the engine goes well I'd remove the balancer,clean it thoroughly and put a bit of locktite(641) on it and tighten the thin up to totque specs. then allow it to set before running it. Hope this works.
Regards Dave