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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: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | This fitting has been observed by many people and there has been much speculation on what is was used for.
I think it was used to put transmission fluid into to the u-joint compartment/bell. This is pure speculation. It would be nice to see GM documentation.
| | | | | Joined: Aug 2010 Posts: 255 'Bolter | | 'Bolter Joined: Aug 2010 Posts: 255 | I would agree with Tim - I don't think it would be used for "grease". That section is open to the transmission gear assembly, and requires gear oil. There are certain types of lube guns designed for gear oil. In my early days working at the local Esso, we had a pressurized gun for gear oil that would also fit a zerk. | | | | | 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 | | | | | Joined: Dec 2006 Posts: 113 Shop Shark | | Shop Shark Joined: Dec 2006 Posts: 113 | Makes sense. Thanks to all | | |
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