front upper ball joints on 1990 Chevrolet Astro

my mechanic told me the front upper ball joints are worn out and needs to be replaced. cost 671.00.

Asked by for the 1990 Chevrolet Astro
The upper ball joints cost about $48 each and one is needed for each side and the labor to remove and replace is about 2.4 hrs, probably should replace the lower ball joints when he has it apart.