In general vibrations that occur inside speed windows are DS based and you can fix it by either having your DS high speed spin balanced, or get a balanced aluminum unit to replace it, or try clocking the DS 45 or 90 degrees from where it currently sits in relation to the pinion flange.
what kind of bushings are in the chassis end of the RLCA's? If you have sphericals with poly urethane caps, then you should get used to some vibration (more of a low frequency hum) being part of the package. Still, the DS seems like your current issue. Mine did that and replacing it with an aluminum one from Griggs fixed that.
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