2003 Chevy Silverado SS AWD noise question
Allan Speicher
lot of noise at slow speeds (5-10MPH) while turning, say like in parking
lots. The noise is more of a dull grinding noise, coming from the front,
present when turning left or right. I'm not sure about this AWD setup, but
I've owned other FWD and 4x4 vehicles with similar front end drive methods
(CV joints) and they never made this noise. Is this common to AWD in
general...or just the Chevy SS? Should I be concerned about it? Only 6000
miles on this truck now. Thanks!
Bobo
mathematics performed in making the descision as to if it should lock the
t-case into 4wd and lock the front axle have always left me wanting more
brains....If you are on dry pavement, you shouldn't be in AWD....Just my
opinion, but it has a little bit a sense to it.........4WD will make noise
like a SOB... and given the fact you are in AWD, there is a chance the
"BRAIN"(TCCM), may think you are slipping (inside wheelse are turning
slower), it may engauge the t-case and lock the front axle and make the
noise you describe ... given the noise you described... sorta.... you said a
lot of noise, so I may be off a little... It could be rap music for all I
know...
"Allan Speicher" <awsp...@chartermi.net> wrote in message
news:1064prg...@corp.supernews.com...
shiden_Kai
"Bobo" wrote
> just a stupid question, but do you have the noise in 2wd??????, the
> mathematics performed in making the descision as to if it should lock the
> t-case into 4wd and lock the front axle have always left me wanting more
> brains....If you are on dry pavement, you shouldn't be in AWD....Just my
> opinion, but it has a little bit a sense to it.........4WD will make noise
> like a SOB... and given the fact you are in AWD, there is a chance the
> "BRAIN"(TCCM), may think you are slipping (inside wheelse are turning
> slower), it may engauge the t-case and lock the front axle and make the
> noise you describe ... given the noise you described... sorta.... you said
a
> lot of noise, so I may be off a little...
Bobo....he's got the AWD version....the 149 single speed t/case with
the viscous coupling.
Ian
Bob
"shiden_Kai" <violet-lighte...@hotmail.com> wrote in message
news:QR89c.18168$QO2.2315@pd7tw1no...
seemed to have quite a few problems with the couplers locking up.
Bob
shiden_Kai
"Bob" wrote
> I wonder how those couplings are working out? Jeep used that set up and
> seemed to have quite a few problems with the couplers locking up.
There are very few Chevy trucks that use this set-up. The
AWD full size vans use it, and the Chev trucks that are
AWD use it. The Cadillac trucks use the identical t/case
but no viscous coupling, just an open differential in the t/case.
They use the ABS and the Stability (can't remember the correct
name) system to hold wheels that are spinning in order to
get power to the ground. At first I thought this system was
pretty slick, but when I actually went out and road tested
a couple of them....nasty stuff. It doesn't seem to have
a good enough reaction time. By the time the system starts
to catch the spinning wheel, the vehicle has gone right around.
Anyway, so far, I haven't seen any problems with the
viscous couplings. But we are seeing absolutely tons
of front diffs and auto t/cases blowing up. The 99 and
2000 trucks are coming off warranty and it's costing
the customers about 4 grand to overhaul the front
diff (with new gear set) and overhaul the clutch pack
in the t/case (if they are lucky, that's all that is wrong
with the t/case)
I've said it before....I love GM and their "leading edge"
technology. Money, money, money for the tech.
Ian
Bobo
code..... I have yet to actually see one of these...
at my dealer all we ever see is the regular NP8 pushbutton with auto
selectable... you know, the famous 2725... mode switch malfunction......
shiden_Kai
"Bobo"wrote
> I must have missed the section where he said he had NP3 for an option
> code..... I have yet to actually see one of these...
> at my dealer all we ever see is the regular NP8 pushbutton with auto
> selectable... you know, the famous 2725... mode switch malfunction......
I don't think he actually specified the option code,
but I don't know what other t/case he would have
if it's the "AWD" version. I haven't seen one yet
either, just the Cadillac version which doesn't use
the coupling.
Yeah, if I get a work order with the service 4x4 light
complaint, I often just walk out to the vehicle with the
switch and scan tool. Seeing as they only want to pay
.2 hrs for the op.
Ian
Allan Speicher
do. Although I can rattle them off for the 560 series trucks...but that's
another story. As to this AWD SS 1500, I assume it is always in AWD "mode".
Electronically controlled, as there is no button control module to select
2WD, 4WD, or AWD. Matter of fact, on this SS truck, there is a small
storage spot on the dash where they remove that 2/4WD push button module
that is on all the other 1500 4x4 trucks. SOOO...I don't know what mode the
trans is in per say when this noise happens, since I have no control (i.e.
no pushbuttons or levers to use) of the system.
"shiden_Kai" <violet-lighte...@hotmail.com> wrote in message
news:6pG9c.35545$R27.25441@pd7tw2no...
shiden_Kai
"Allan Speicher" wrote
> Well, I don't have access to the option codes for these trucks like you
guys
> do. Although I can rattle them off for the 560 series trucks...but that's
> another story. As to this AWD SS 1500, I assume it is always in AWD
"mode".
> Electronically controlled, as there is no button control module to select
> 2WD, 4WD, or AWD. Matter of fact, on this SS truck, there is a small
> storage spot on the dash where they remove that 2/4WD push button module
> that is on all the other 1500 4x4 trucks. SOOO...I don't know what mode
the
> trans is in per say when this noise happens, since I have no control (i.e.
> no pushbuttons or levers to use) of the system.
These transfer cases are not electronically controlled. They either
use a viscous coupling to control the flow of torque between the
front and rear wheels, or if the vehicle has a "stabilitrak" system,
(usually the Cadillac's) then the transfer case is a completely
open design and the flow of torque is controlled by the ABS
and Stabilitrak system, controlling wheel spin individually
at each corner as required.
Ian