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Hey guys,

Sorry for the dumb question but I gotta ask. I am changing the fluid in my rear differential for the first time and I have been following Guzzles Tutorial which can be found here Welcome to guzzle's Rear Differential Maintenance Web Page for anyone who is interested, though the process is completely straight-forward. I am always so meticulous about cleanliness and when it comes to working on my truck, and I always clean and cover anything I have apart. I was/am in a bit of a hurry this time and when the instructions said take a trash bag and cover the ring gear to keep particles out I grabbed a new trash bag, got under the truck, turned it inside out, and tucked it in. When I went back in my shop I noticed that the other trash bags in the box had very little fine dust on the insides so I checked the one I wrapped around the gears and it had some particles on it as well. We are talking a little bit of dust here but like I said Im a little OCD about these kind of things. Anybody forsee any issues with a little bit of dust in a Ford 10.5" differential?
I figure I may as well ask another question while Im here. The 75w-140 that came out was definitely darker than the new stuff and though I think gear oil has always has a burnt smell, There was a difference in the smell of the old compared to the new. Is this something I should be concerned about?
 

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Hey guys,

Sorry for the dumb question but I gotta ask. I am changing the fluid in my rear differential for the first time and I have been following Guzzles Tutorial which can be found here Welcome to guzzle's Rear Differential Maintenance Web Page for anyone who is interested, though the process is completely straight-forward. I am always so meticulous about cleanliness and when it comes to working on my truck, and I always clean and cover anything I have apart. I was/am in a bit of a hurry this time and when the instructions said take a trash bag and cover the ring gear to keep particles out I grabbed a new trash bag, got under the truck, turned it inside out, and tucked it in. When I went back in my shop I noticed that the other trash bags in the box had very little fine dust on the insides so I checked the one I wrapped around the gears and it had some particles on it as well. We are talking a little bit of dust here but like I said Im a little OCD about these kind of things. Anybody forsee any issues with a little bit of dust in a Ford 10.5" differential?
I figure I may as well ask another question while Im here. The 75w-140 that came out was definitely darker than the new stuff and though I think gear oil has always has a burnt smell, There was a difference in the smell of the old compared to the new. Is this something I should be concerned about?
Dust particles should not create any issue in your Rear Diff but how much it affects your OCD is another matter. :winking:

Old gear oil is going to be darker than new and could have a different smell. Some of that could be the result of the likelihood you are using a different product than what was originally installed and some of it is just the result of use.

Rest easy and know you are amongst company who share your OCA (Obsessive-Compulsive Advantage).

Cheers
 

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heheeheheeee- you sound like me.... :)

so the debris is likely powder makers of those things use to keep them from bonding..

i don't reckon a ton of the stuff will do you any favors, but a little ain't going to hurt anything... call it 'additional friction modifier'....
 
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