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Weird Front End Problem?

ultravorx

Full Member
Joined
Nov 16, 2002
Messages
360
Location
New Britain, CT
Hey guys, whats up. I was wondering if any of you have seen or heard about this. When i have my av in "auto" it drives and sounds fine, but when i take a turn especially on in incline or decline, i hear a low harmonic hum. i am aware that some people had this problem all the time, but mine is only when turning. :8: any suggestions :rolleyes:
Frank
 
Hey Ultra, i have had the clicking/ticking sound when turning going real slow. they went in and took apart my intermediate steering shaft and greased it, but as for as a hum,,,,,,,,,,you got stumped on that, unless it is the pump itself whining or something.
zeeyaaaaaaaaaa
 
:(
Gents,
I have 2002 z77 4x4 and just recently I have noticed a clicking or grinding noise in my front end. Especially when slowing down.
It is Christmas now but next year I will put it in the Shop to investigate.
 
One thing to keep in mind when you are in "auto" 4WD.

The way I understand that it works is that the front hubs get locked, and the front drive shaft clutch in the transfer case is normally disengaged. Then, when slippage is detected, the transfer case clutch engages to give you four wheel drive.

What this means is that when you are in auto, the front drive shafts, differential, and drive shaft back to the transfer case are always spinning, even if the transfer case clutch is not sending it power.

I have noticed at times that when I am in auto, I will sometimes notice a little gear noise, especially when cornering. I don't so much as hear it as I feel an almost imperceptable vibration or growl in the steering wheel and my feet. I've pointed it out to my wife when it happens, and she can neither hear nor feel anything. She thinks I'm nuts. (She's probably right!) :2:

I'm chalking this up to the fact that you are spinning these shafts and diff gears without any load on them, and there is just a slight amount of backlash and gear noise in them. I don't think that it's a problem. It's similar to, but less than, the additional gear noise/vibration when in 4Hi.

I would not call this sensation a whine, grind, click, or thump, but I could go along with ultravorx's description of a low harmonic hum. Generally lasts for less than a second at a time.

Could this be what you are experiencing?

-- SS
 
ShapeShifter said:
One thing to keep in mind when you are in "auto" 4WD.

I have noticed at times that when I am in auto, I will sometimes notice a little gear noise, especially when cornering. I don't so much as hear it as I feel an almost imperceptable vibration or growl in the steering wheel and my feet.

-- SS

I get that exact same noise/vibration during Auto 4WD and attribute it to your explanation as well.

BTW - I may be using Auto 4WD on Christmas when I travel to NY in the predicted snowstorm!
 
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