Sounds like the gear box is stripped, Our 3990 started the jumping and shaking this spring. I took it to a dealer who indicated rollers would help, but it was a very large job. I got home and the kitchen slide gear box stripped the gears. I purchased a high torque motor and gear box assembly, and then installed rollers on that slide, and the large sofa slide. It was very easy to install, not as complicated as you will see on you tube. Once you have the tools ready, and after the first roller is done, it might take 5 to 10 minutes or less per roller.
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