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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: Mar 2001 Posts: 316 Member | | Member Joined: Mar 2001 Posts: 316 | The fill plug on top of the pinion housing is for adding fluid to the pinion bearings only after extended storage , to insure the truck was not loaded and run under a heavy load without lubricant distributed through the bearings.
I think it is not necessary to do this and it will "overfill" the differential.......requiring you to drain some out after the initial run (after L O N G storage, rebuild; that's another subject).
*** GMC ***
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