You may well want to pull the pulleys and clean/grease them real good if it has been 5 years. I haven't owned a Deore RD but friends have and I never noticed any excessive noise. Is it aligned straight through the cage and rear cogs?
Bill
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Semper Fi, USMC, 1975-1977
I Can Do All Things Through Him, Who Gives Me Strength. Philippians 4:13