1997 GMC Yukon Transmission fluid in the airbox

BUTTICCI

MEMBER
1997 GMC YUKON
V8
4WD
AUTOMATIC
123,700 MILES

I just purchased my Yukon and noticed transmission fluid in my airbox and all over the filter. How and where did this come from? It also sounds as if the torque converter is whining, only in gear, is one the cause of the other? I have heard its a vacuum modulator or just the converter going out. The truck shifts fine and no slipping so Im lost. Please help!

6 Replies

PEAR69

MECHANIC
1,482 POSTS

Are you sure it is transmission fluid. It is more likely to be air filter oil. Some air filters like a K&N require oil, that is the color of transmission fluid, to be sprayed on them.

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Sunday, January 24th, 2010 AT 6:35 AM

BUTTICCI

MEMBER
5 POSTS

The fluid is reddish and is only on the bottom of the airfilter and in the bottom of the air box. About 3oz of fluid in the air box.

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Sunday, January 24th, 2010 AT 6:09 PM

BUTTICCI

MEMBER
5 POSTS

Im sure its not air filter oil 100%. Is there any way for tranny fluid to get into the intake?

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Sunday, January 24th, 2010 AT 9:50 PM

PEAR69

MECHANIC
1,482 POSTS

Unless tranny fluid was intentionally put there or the engine was filled with tranny fluid by mistake (in which case it would have failed by now) - I would say NO. It is impossible for transmisson fluid to get into the air filter/air box.

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Sunday, January 24th, 2010 AT 10:59 PM

BUTTICCI