I’d at least do the belt WP33002535 as well and take a look at the idler pulley WP6-3700340 to make sure it isn’t worn out.
https://www.appliancepartspros.com/whirlpool-vbelt-tumbler-wp33002535-ap6007983.html
https://www.appliancepartspros.com/whirlpool-bearing-idler-assembly-wp6-3700340-ap6009859.html