Balancer will sound worst at idle and change if you pull the belt. I can usually feel defects in the rubber. What is the oil pressure doing ? " just over 59,500 miles". Pretty good but are not selling for $10k unless from someone who knows them and with a gaurantee. What condition is the top in ? Is the AC cold ? Both are $1,000 items. How old are tires & any good ? Dorman balancer is $70 on Amazon.