I’ve been working on my F150 and had to change the rear gear oil today. The smell was horrible! Anyone else experience this?
It smells funky for sure, but it’s nothing compared to how it tastes!
It’s weird, you can almost feel the smell in the back of your head.
Jessie said:
It’s weird, you can almost feel the smell in the back of your head.
Exactly! You can’t even describe it properly, people just have to experience it themselves.
Jessie said:
It’s weird, you can almost feel the smell in the back of your head.
Exactly! You can’t even describe it properly, people just have to experience it themselves.
Stale ketchup and chocolate—that’s how I describe it. Gear oil is nasty.
It smells bad because of the high sulfur content. High-sulfur lubricants handle extreme pressures better.
To quote every dealer ever, “They all do that.”
Val said:
To quote every dealer ever, “They all do that.”
Do they actually change the diff fluid though? I had to top it off because it was low. Some of the oil was honeycomb-colored, while the rest was dark.
@Blane
They say they do it, but that was the point of the joke.
If you put a gun to my head and asked me to guess a smell, I’d nail this one every time. I can’t stand it! 
Ellery said:
If you put a gun to my head and asked me to guess a smell, I’d nail this one every time. I can’t stand it!
Totally different from motor oil, that’s for sure. Lol.
The rear always smells bad. Try the front next time!
Rylan said:
The rear always smells bad. Try the front next time!
I changed the rear today and let it sit for a bit. I’m refilling it this afternoon. Tomorrow, I’ll drive to grab what I need for the front.
Rylan said:
The rear always smells bad. Try the front next time!
The front diff takes pink oil.
Rylan said:
The rear always smells bad. Try the front next time!
Weird… both of mine smell fine.
Burnt automatic transmission fluid smells ten times worse.
Older Trac-Lok diffs used a friction modifier that smelled way worse.
I put a limited slip diff in mine last week. My garage still stinks from the smell.
Kai said:
I put a limited slip diff in mine last week. My garage still stinks from the smell.
What diff did you install?