Transfer case and diff oil change

[Lr4KP]

Today I changed the oil in the transfer case and both differentials. The rear had quite a bit of gray looking stuff on the magnets but it all was really smooth in texture when I rubbed it with my finger. Kind of felt anti seize. Is this normal? Also I noticed oil leaking on the bottom of the engine area, mainly near what looked like an oil cooler. I’m not sure where it was coming from.

 

[ryanjl]

That's just small wear from your gears. Fine metal particles. So long as there are no big chunks of metal you are probably okay.

 

[Lr4KP]

That’s what I was thinking I just wanted some confirmation haha

 

[powershift]

The oil leak could be from the brake vacuum pump. Mine was leaking there before I had it replaced. Its used to pre-pressurize the hydraulic braking system. Its a DIY job.

 

[Al Pizzica]

Model year and mileage would help for context.
Oil leak or seepage or sort of wet? Amount of oil helps.

 

[Tapps33]

Ok, oil leaking from the bottom of the engine is a VERY open ended question.

Before I give you the usual suspects, are you leaving any oil on the ground?

Ok, common oil leak points:
1. Valve covers. Over time they just start leaking.
2. Vacuum pump: (Front bottom of engine on the passenger side). There's an o-ring seal that wears out and starts leaking.
3. Tranmission cooler (also front bottom passenger side...actually below the engine mounted to the cross member). The coolers them selves have been known to fail...and they will definitely leave oil (it's actually trans fluid, but because ZF fluid is brown it's hard to tell the difference) on the ground.

Just some things to check.