I replaced the fluid in my rear diff. But I think I replaced it through the wrong opening.


I have HD package and refilled through the long hex bolt not the rear of the diff. I’ve driven a bit on it too.

What at is the bolt and what have I done here? And where is the fluid? 🤬

I know now if probably should have filled up here instead :





So. What can I do? I think I majorly messed up here.

 

The only problem I can see is that you might have under/overfilled as its fill to spill on the actual fill plug. I don't remember seeing the plug you filled, but I get so used to seeing things sometimes an obvious thing I miss.

 

Thanks abran.

I filled it via the first picture plug. I later found this was not a plug but more of a bolt. Then I found that this helps set the differential in some way . Have I messed up my diff?

Also. This is strange but I thought these e-diffs have a long hex bolt that sticks out far from the diff? Mine was just this....

 

Ok, here is one I rebuilt off an 05’


here is a new genuine we have on the shelf with 2012 date code:

 

go back and refill from the proper hole until a small stream comes out and close the fill plug. you should be fine.

 

Thanks. I take it this means drain and refill using the same just into a different hole....

and what of the bolt? What have I done now I’ve removed and replaced it?

Does it it set the clutch or something up?

 

So there was a bolt like in my first photo and you remove that and replaced with a drain plug?

 

Also, no do not drain just still to the point to where it’s at the right level.

If memory serves me that bolt is just a stop for one of the assemblies that turns inside the case

 

No no. The plug I removed (which had a long bolt on the back side of it) was like your 2012 example.

I did did not have the hex type protruding bolt at all.

 

OK, I think you are good just make sure that the level is proper