What a bad guibo does
The symptom list is a clunk on takeoff, a thud as you get on or off the throttle, vibration under load if the disc is badly torn, and a torn or cracked guibo you can see on a lift. The note says a torn guibo often shows up as a clunk in parking lots or stop-and-go traffic. See Driveshaft Flex Disc (Guibo). The broader clunk and vibration pages are the BMW Clunk Over Bumps: Suspension and Driveline Causes and the BMW Vibration and Steering Shimmy: Brakes, Mounts and Driveshaft.
The part has three names
The page says a guibo, also spelled giubo, is the rubber flex disc in the driveshaft, and that it is the same part. xDrive cars may also have a front propshaft coupling. The cars named are the E9x, F3x and G3x 3 and 5 Series and the E60. See BMW E90 repair costs, BMW F30 repair costs and BMW G30 repair costs.
What the job includes
Pelican lists about 3 hours DIY on an E90, and the exhaust and heat shield usually come down. Replace the self-locking nuts. One general shop billed 2.5 hours of labor for a guibo swap. Mark the driveshaft orientation before unbolting. Inspect the center support bearing while the shaft is loose. That inspection is the only center support bearing guidance in our data. There is no separate price for the bearing, so do not add one to a guibo quote unless the shop has written it as its own line.
What it is not
Shudder on a tight turn is the transfer case, not the guibo. See the BMW xDrive Transfer Case Shudder. A clunk over bumps from the front, with a shimmy under braking, is the thrust arm bushing (Front Control Arms & Thrust Arm Bushings). A clunk shifting between reverse and drive on an E46, with cracks in the trunk floor, is the BMW E46 Rear Subframe Cracks. A corner that sits low on an X5 is air suspension, in the BMW X5 Air Suspension Sag.