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Click to EnlargeA common wear item on BMWs over a period of time is the drivetrain guibo.  The guibo serves as an interface between the transmission and the driveshaft.  Since the guibo is primarily made from rubber, it acts as a damper when shifting and engaging into gears, so that the transfer of power to the driveshaft is smooth and dampened, instead of abrupt and harsh.

Replacement of the guibo depends on age and driving style.  We have seen vehicles less than 12 months old with 15,000 miles that had already started developing cracks around the bolt holes.  We have also seen vehicles over 5 years old and over 100,000 miles with guibos without any stress cracks whatsoever.  Needless to say, if you drive your car aggressively, your guibo may have to be replaced sooner than others.

Without a visual inspection of the guibo itself, an audio sign that the guibo may have started to crack is a "clicking" noise under specific circumstances.  Below is a method we've been able to replicate the "clicking" sound.

Step 1: Find a straight, downhill section of road that will allow you to maintain vehicle speed of between 15-25 mph.
Step 2: Begin accelerating, slowly, in first gear.  Shift into 2nd gear, continue to depress the accelerator pedal slightly.
Step 3: While going down the hill, immediate LIFT OFF the accelerator pedal.  The vehicle should immediately start slowing under engine power.  At this point of immediate release, the "click" should be audible.
Step 4: If "clicking" sound is audible, inspect vehicle guibo to determine if it is indeed cracked or fractured.

Installation requires removal of the exhaust and driveshaft center bearing as a minimum.



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