I've never replaced the bearings but have taken one apart several times. I went through several rebuilt units and finally was able to piece two together that worked. They would be very easy to replace but the key, as always, in this scenario is getting the correct bearing to install. If you know someplace locally that will sell you precise, high quality bearings, and only two of them, or a rebuild place that will sell you the correct parts, then it might be and easy fix.

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Sam

84 300SD 350K+ miles ( Blue Belle )