Drive couplings connect two shafts together. This allows the drive shaft to move the secondary shaft at the same speed. Universal joints (also known as ‘u-joints’) do much the same thing. Yet they connect shafts at different angles and allow them to move more freely, while still providing the right level of rotary power. There are key symptoms of failing couplings/universal joints to listen out for. These include excessive vibration and loud chattering or screeching noises due to improper changes in rotation. Reasons for failure include improper installation and use of the wrong (or low quality) components. You can be sure to find the right couplings or universal joints for your car at Euro Car Parts.