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Hi Larry: It appears that every 722.3 transmission has this problem. I educated myself a little on the subject. The reverse laminar brake is anchored to the case and to the rotating core. While it is only energized during reverse, the discs make some contact during regular driving and that wears them thin. When the stack becomes thin, the piston that compresses the stack in reverse, begins to bottom out. The piston has radial ridges. What you hear is each ridge touching. At first, it happens only when the transmission is cold. If you replace the laminar plates at that time, no damage has been done. If you wait, you get metal debris that migrate and you have to completely overhaul the transmission. The nice thing about it is, that you get a warning. Are you going to do the job yourself?
Please note: If there is anyone who finds that my understanding is wrong, please correct me !
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