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Repair Topics / U-Joint Problems

MORE: U joint questions

Car U-Joint Questions

Question: 1999 Chevrolet Tahoe 4X4, mileage: 125,000. I am an ASE CMAT for 20 years and I just bought a used but cherry Chevy Tahoe 4X4. I completely serviced the vehicle but was puzzled by the strange plastic plugs on the drive shaft u-joints. Three U-joints have strange plastic inserts on one side of each bearing. How are these lubed? Do I take the plastic inserts out or use an injector tip over them? If removal is necessary, is there a procedure? I am unable to find any reference to these strange plastic inserts in GM TSBs. I am not a GM brand tech but appreciate its strength and many design and construction methods. Thanks very much for your help.

Answer: Plastic plugs on the u-joints, are used by the factory to assemble the u-joint by injecting epoxy to hold the u-joints together. You will notice there are no snap rings on the u-joint cups. The u-joints do not require lubing, press apart to replace when failed.



Question: 1999 BMW 528i mileage: 154,000.  How difficult is it to change a flex-joint in this vehicle, and are there any difficulties I need to look for?

Answer:   If you have changed drive joints before on other cars, it is not very difficult.

Repair Topics / U-Joint Problems

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