12.Whenever you do driveshaft service work (such as installing new universal joints), it's an extremely good idea to have the driveshaft checked for straightness and balanced. Even if you install new U-joints, if the driveshaft is bent or out of balance, the new parts will wear prematurely. In addition, your car will experience weird vibrations at various road speeds. The folks at Wenco Industries perform full driveshaft service, including driveshaft straightening and balancing. Balancing usually costs about $35, straightening is roughly $15 and U-joint installation is $7.50 per unit. If your driveshaft needs to be shortened, Wenco can usually perform the work in one day for about $35.