If you haven't disassembled the ball and U-joint then it
should still have enough lubricant to get started with. It's
not like a pressure system, just simply a splash type bearing.
Make sure your oil level stays just below the fill hole on the
side when it is cold. After you drive it a short distance
lubricant will work its way back to the U-joint. Check the
fluid level several times after a refill till things level
out.
If you've disassembled and cleaned/serviced the ball and U-joint
and it is dry, then GM instructs you to add lubricant at the
top of the tail housing thru the VERY SMALL 1/8 NPT hole seen
with a pipe plug in it here in this picture.
http://www.pbase.com/dennygraham/image/141699781/original Be aware that if you add oil at this point, that is is going
to add to the level in the transmission. You don't want the
oil level to get over the fill hole when the oil is hot or it
will puke out the front of the transmission.
dg
