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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 2010 Posts: 38 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2010 Posts: 38 | What is the purpose of the small plug located toward the top of the U joint housing on the back of a Munci 4 speed trany? | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 |
You might be referring to the hole through which the factory put in the gear oil after assembly. On some of the the SM420s, instead of a plug there is a grease nipple that serves to further confuse people (the gear oil was "injected" through that nipple). That hole/nipple is not normally used by us mortals (if I am wrong, we will hear about it).
| | | | | Joined: Aug 2010 Posts: 38 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2010 Posts: 38 | | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 |
That's what I was told by people on this discussion board. I must be true?
| | | | | Joined: Aug 2010 Posts: 38 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2010 Posts: 38 | Thanks for the help. As I think about it, your answer makes sense from a prosses point of view. | | |
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