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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.
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