- #3744 of 3813
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05 w/ possible transmission issue
by dsiah12345
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Sep 09, 2007 (1:38 pm)
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I have an 05 with 31,000 miles.. bought at dealer..said it was leased....i drove a Yukon for 3 years and loved it...can't afford the 07's anyhow....the armada is 4X4 and i noticed that after driving it around town or either on the high way..after about 10-15 min. of being on the road..when i do a complete stop and start to go again...the engine feels like it's pulling and it makes a loud roaring noise....it also made that noise in reverse yesterday coming out of the driveway..which is slightly inclined..however i am really noticing it more and more and i'm getting worried..took into the dealer and nada..nothing..however..i know this noise is not normal..anyone else have this noise and pulling i'm talking about? It sounds like it's stuck in another gear..but not first gear....
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- #3745 of 3813
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Re: 05 w/ possible transmission issue [dsiah12345]
by paisan
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Sep 09, 2007 (4:13 pm)
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Replying to: dsiah12345 (Sep 09, 2007 1:38 pm)
hmm a pre-leased vehicle? Probably a bad trans. Everyone I know who has "leased" a vehicle basically treats em like trash since it's not their car in the end.
I'd start with a trans flush and fill and take it from there.
-mike
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- #3746 of 3813
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Re: 05 w/ possible transmission issue [paisan]
by dsiah12345
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Sep 09, 2007 (4:22 pm)
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Replying to: paisan (Sep 09, 2007 4:13 pm)
it's still under warranty, i bought it a month ago, should i take it to the dealer and have them do this..should they be responsible for the bill?
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- #3747 of 3813
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Re: Thanks for the replies [paisan]
by shark715
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Sep 09, 2007 (4:49 pm)
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Replying to: paisan (Sep 07, 2007 3:47 pm)
Mike, the '08 QX56 does have the same transfer case switch as the Armada. It has the 2WD position as well as 4LO. The "auto" position is not really AWD. Under normal driving condtions all the torque goes the the rear axle. When a sensor determines that the rear axle is spinning significantly faster than the rear axle, it sends torgue to both axles. An AWD system is ALWAYS sending torque to both axles. The transfer case isn't much different than the one on my wife's '96 Explorer. Works great, and you rarely can detect when it starts or stops sending torque to the front axle.
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- #3748 of 3813
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Re: Thanks for the replies [shark715]
by paisan
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Sep 09, 2007 (5:11 pm)
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Replying to: shark715 (Sep 09, 2007 4:49 pm)
That must be new on the 08 QX56, cause I know the 04-07 had only one mode of AWD. I believe the initial torque split is about 20/80 with a rear bias because I've tested it on snow/ice/sand/mud/wet boat ramps and the auto-mode definitely puts some torque to those front wheels before slippage occurs, probably very similar to the bosch system used on the Isuzus for years.
-mike
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- #3749 of 3813
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Hmmm
by obyone
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Sep 09, 2007 (9:56 pm)
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"When a sensor determines that the rear axle is spinning significantly faster than the rear axle, it sends torgue to both axles. "
What exactly does that mean?
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- #3750 of 3813
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Re: Hmmm [obyone]
by shark715
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Sep 10, 2007 (9:24 am)
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Replying to: obyone (Sep 09, 2007 9:56 pm)
Under normal conditions all the engine power is sent to the rear wheels. When the rear wheels lose traction, for example, in snow or mud, power is also sent to the front wheels. You could say that the truck automatically switches from 2 to 4 wheel drive when needed. The switch is made so fast that you rarely notice the rear tires slipped before the front axle engaged. Some transfer cases make the switch mechanically (I think the Armada/QX56 is an example of that), and some electronically (I think the Acura MDX is an example, although if I'm correct I think the MDX normally sends power to the front rears and adds the rear wheels when it detects the fronts losing traction, but the idea is the same).
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- #3751 of 3813
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Re: Hmmm [shark715]
by paisan
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Sep 10, 2007 (6:46 pm)
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Replying to: shark715 (Sep 10, 2007 9:24 am)
I'm pretty sure though that the Armada/QX and several others actually put a small percent to the non-main axle to pro-actively prevent slippage.
-mike
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- #3752 of 3813
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Issues with the 2008
by kwchilds
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Oct 17, 2007 (8:17 am)
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Has anyone come into issues with the 2008 model with the back making rattling noises and the third row seat making a horrible screaching noise when lowered and raised?
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