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Unread 12-17-2010, 07:45 AM   #1
Soldierfoley
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1990 YJ Wrangler 
 
Join Date: Aug 2010
Location: Roanoke Va.
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Humming sound in 4 high

We got our first real snowfall yesterday and I was deiving about 45mph in 4 hi when I noticed a slight humming noise in the front. When I shift back into 2 wd it goes away. Just wondering if this is normal or if I need to check the fluid levels and all that jazz. Any opinions would help.

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Unread 01-10-2011, 07:02 AM   #2
Soldierfoley
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Cmon guys 33 people have read this and no one can say if their front end has a slight hum in 4 high? Help out a noob! I'll buy you a beer
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Unread 01-10-2011, 07:07 AM   #3
YelloJeep
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I am by no means an expert but this morning (snow) my Tacoma has a bit of a hum also. Haven't used the fwd Hi in my Jeep really. Only 4lo in the woods behind my house...
My guess is that it is normal. I could be wrong though. Just figured that if noone else was helping you out....
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Unread 01-10-2011, 07:33 AM   #4
grandboost98
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you probably need to get the front driveshaft balanced
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Unread 01-10-2011, 07:40 AM   #5
Mudmouse990
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you should be fine fwd isnt really made for high speeds its ok on snow because it will slip but dry pavement is a no no haha i figured you knew that
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Unread 01-10-2011, 08:15 AM   #6
WRMJeep
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Clearly you are concerned about the sound. First thing I would do is check the front axle fluid level along with take a look at the front driveshaft. You may have the semi common issue of the front drive shaft rubbing against your exhaust downpipe / headpipe.

On mine the sound is more like a rusty grinding sound than a hum. But maybe once you get fast enough turns into a hum.
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Unread 01-10-2011, 09:31 AM   #7
Soldierfoley
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Thanks guys. @WRMjeep I don't hear any rusty sound, just a slight hum. Sounds a little like the blower motor but is coming from the front axle.
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Unread 01-10-2011, 09:38 AM   #8
pasinbuy
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Quote:
Originally Posted by Soldierfoley View Post
We got our first real snowfall yesterday and I was deiving about 45mph in 4 hi when I noticed a slight humming noise in the front. When I shift back into 2 wd it goes away. Just wondering if this is normal or if I need to check the fluid levels and all that jazz. Any opinions would help.

I normally do not comment when someone states something that just makes me shake my head. But in this case I will break my silence.

" or if I need to check the fluid and all that jazz."

My opinion would be to go ahead and check the fluid.
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Unread 01-10-2011, 10:15 AM   #9
jeepyj13
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1993 YJ Wrangler 
 
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Location: greenville, mississippi
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we got snow down in MS yesterday and i drove my yj in 4hi it had slight hum when i got to 45mph but i assume thats normal as long as the wheels are slipping cause the tcase is open with no center differential like awds. if your on dry pavement switch back to 2wd cause that can put wear on drivetrain and soon damage tcase. idk i could be wrong about the normal of humming but the rest is true for the tcase.
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