Definitely, have your driveshaft balanced. After you install new u-joints. Remove the rear yoke too and take it with you to give to the balance shop. They will need both yokes to balance the driveshaft. Only cost me, 60 bucks. Well worth it. I chased a small vibration in my driveline over 60 mph for nearly a year. The driveshaft balance and rear yoke repair removed all vibrations.