The driveshaft of the company's roadster is given flexibility by BMW Z4 Universal Joints to keep delivering torque as the suspension rises and falls. The Universal Joints at the transmission end and differential flange consist of a cross-shaped trunnion fitted with needle bearings in hardened steel cups. Clips hold each cup tight so that power flows smoothly through every BMW rear wheel launch. Each cup contains sealed grease, enabling it to cushion the bearings. However, once this grease dries out, the joints will make a clunking, vibrating, or squeaking noise that a Z4 driver will pick up on quickly. The inspection is simple. Just twist the shaft to feel for play and look for broken clips, split seals, red dust, or end-play since any of these found means a fresh pair of Universal Joints is required to stop further wear. Over the years, BMW has stuck to this tried-and-tested design, so if you own an early E85 Z4 or a later G29 Z4, the key difference is only that some factory Universal Joints remain permanently lubricated while optional serviceable Universal Joints gain a grease fitting for longer life, helping preserve the characteristic BMW handling feel.
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