I guess you mean the nipple, AKA Zerk fitting.  You may need to raise
the car differently and/or reposition the shaft to gain access,
especially if you are wtiting about the front U-joint.  You might check
to see if the U-joint was installed incorrectly.  There's an indentation
in the housing to allow access to the fitting. The U-joint sometimes
gets rotated to the wrong position when it's replaced. 
 Cheers,
  CR
Fabrice.MARINET@st.com wrote:
> 
> Hi,
> 
> I didn't succeed in reaching he niddle of the propeller shaft U joint
> with my grease gun (works well with all others).
> Is there different size of grease gun link/extremity diameter ?
> 
> Thanks for advice.
> Fabrice
> Aix en Provence, France
> '71B from Texas
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