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Labor Day Putting down your wrenches or time for
MORE wrenching? 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Aug 2004 Posts: 1,417 ODSS Lawman | | ODSS Lawman Joined: Aug 2004 Posts: 1,417 | Tim is correct. It is the opening to lubricate your u-joint. By far it's the most missed service item on our trucks. From the factory, it had a square headed pipe plug. At some point someone put this fitting on you truck.
The service manual does say your u-joint needs one pint of gear oil. I would not recommend grease. I have seen u-joint failure partially caused by grease (possibly not enough).
I use a cheap small hand pump with a small hose to get gear oil to that spot one a year. I drive between 3000-4000 miles annually.
SWEET Sergeant At Arms: Old Dominion Stovebolt Society BUNS?!?!?!Where we're going, we don't need no buns.....1950 GMC 450 1951 Chevy 1/2-TonThe GreenMachineIn the Stovebolt Gallery | | |
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