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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: Jun 2010 Posts: 170 'Bolter | | 'Bolter Joined: Jun 2010 Posts: 170 | I was under my 46 1/2 ton this weekend looking at the differential and realized there was no bolt or fitting on the bottom to drain the oil. I have the shop manual & real axel overhal manual, but neither mention how to drain the oil. Was it designed that you removed the back cover to drain? Or is the lower torque tube lock nut supposed to be used as the drain hole. Sorry for the newbie question (I tried the search function first). Thanks. | | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | You can drain it by removing the bottom bolt on the cover, but it's best to remove the cover to ensire that all the old oil is drained as well as being an opportunity to inspect the the internals of the diff.
Bill Burmeister
| | | | | Joined: Aug 2010 Posts: 255 'Bolter | | 'Bolter Joined: Aug 2010 Posts: 255 | You have to pop the cover - a drain plug would be nice. | | | | | Joined: Jun 2010 Posts: 170 'Bolter | | 'Bolter Joined: Jun 2010 Posts: 170 | Thanks much! - for a while there I thought my eyes were getting way worse that I couldn't find the drain plug. Thanks for the confirmation. | | | | | Joined: Mar 2002 Posts: 9,115 'Bolter | | 'Bolter Joined: Mar 2002 Posts: 9,115 | I agree with Longbox. Removing one of the lower bolts will allow the fluid to drain. You should remove the filler plug to let aur in and speed up the process. | | | | | Joined: Nov 2000 Posts: 1,964 'Bolter | | 'Bolter Joined: Nov 2000 Posts: 1,964 | The bottom bolt. It will need some kind of gasket or seal and some suggest a soft copper crush-washer, else it might drip.
Professional Novice
| | | | | Joined: Jan 2003 Posts: 64 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2003 Posts: 64 | I recently did the '58 to '62 1/2 ton punkin' replacement on my '41 3/4 ton that Kip did on his '41. Worked out well and I almost drilled and tapped a 1/2 inch pipe plug in the bottom. When you use the bolt to drain you leave at least a cup of oil behind, also, that would be where any metal particles would end up and it is hard to remove that oil and clean it out well. Alas, I didn't do it cause it was cold and damp and I didn't have a plug....any way it is back together and I am going to be happy with the 3.90 gears.
Opportunity is missed by most people because it is dressed in overalls
and looks like work. - Thomas Edison
1941 AL 3/4 ton 125-1/4 WB, bought by my Great Uncle Matt in 1942. Still in the family.
| | | | | Joined: Jul 2001 Posts: 3,887 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Jul 2001 Posts: 3,887 | quick lube places have a nifty suction rig to clean/change differential and trans, once in a while visit doesn't cost much
Bill | | |
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