I recently changed a bunch of my fluids (transmission, transfer, front and rear diff). Now after i drive it and get out i smell a faint sulfur smell, similar to the smell of the redline gear oil that went in the front and rear diffs. I have checked and it doesn't appear that any is leaking....i torqued all the plugs as specified with new gaskets/washers.

I extended the rear diff breather months ago. The tube extends up my gas tank filler tube. I did reinstall the little breather plug on the end of the tube. Could the smell of the diff fluid be escaping through the breather tube and i'm smelling it as i walk past?

Has anyone else had similar problems? Is this something i need to track down/fix? i'm using redline 75w90 front and back. the smell is very similar to the smell when i was filling it

thanks
RC

oooooh oooh that smell can't you smell that smell.....

 

I love the smell of sulfer in the morning.... smells like...fresh gear oil!!

 

Could very well be the breather.

Or leaking rear axle seals.

Crawl under your truck and look at the inside of your rear wheels. They could be wet with gear oil which is leaking. Did you switch to sythetic oil? Synth oil can cause oil seals to swell and leak when they never did before.

 

Did you spill any on anything at all, i did a clutch in my buddies truck over a year ago and i spilled a little gear oil, i can still smell it in the cab of the truck and it doesnt leak one bit.

 

rotten egg under your seat?

 

it could be farting... and in the garage, that's bad

gear oil doesnt smell like sulphur... but sulphur does come from the CAT when your engine is working hard.