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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: Nov 2005 Posts: 23 Wrench Fetcher | | Wrench Fetcher Joined: Nov 2005 Posts: 23 | I have a 1949 3600 (3/4 ton) truck. I drained and removed the rear diff cover today and I have a re-fill question? I am not sure how to fill this rear diff? I guess I could pour it in the hole in the rear of the cover, but is that enough fluid?
Or, I also removed a fairly long bolt from the driver's side of the diff. It is about 4 inches long and threaded all the way. What is this bolt? Should I fill it from this hole, or the one in the rear of the diff? Also, should I use any special oil? Just a 90 weight gear oil? | | | | | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | The long bolt: If you are talking about a bolt that is not a cover bolt, that is the bolt that holds a thrust pad in place. It is a brass pad that stops the ring gear from distorting under heavy load. I don't know exactly what you do from here.
As for the filler hole, you just purchase your gear oil in the plastic bottles with the pointed spouts and pour it in. The level should be 1/2" below the hole when not warm. | | |
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