Problem Description and Possible Solution
The front or rear differential may develop an abnormal noise due to worn bearings or another internal fault. Our technicians tell us that a complete overhaul of the affected differential is commonly necessary to correct this condition.
Average mileage: 141,346 (30,800–248,000)
Drive Trains affected: 2WD, 4WD
12 model years affected: 1999
, more2003, 2004, 2005, 2006, 2007, 2008, 2011, 2013
57 people reported this problem
After 30 or 40 miles on freeway, whinning sound from front end. Gets louder but levels off. When you slow down, sounds like metal grinding, REALLY bad. If you turn at low speeds, gear skipping feeling, wheels shake. If I let the truck sit and cool for a few hours, its ok, until 30 miles of freeway, even at 60mph.
This is the second time with this issue. Replaced differential twice; at 63,000, then 90,000 before, and here again at 98,000. Hate this truck. $50,000 piece of junk. My 98 Pontiac was 3500 bucks, and I drive it instead. I will never get 100,000 miles on this Denali, because I can't drive it!
Rear end whining when on the gas, quiets out when you let off... getting repaired by a local transmission shop.
front end making a winding noise
The front wheel drive sounds like it's making all kinds of cranky noises grinds when I turn when I take off really hard it's just not a good thing
Left front differencial is making old noise
Actually mine is a SLT but anyway on a recent vacation i drove from MN to VA & back to MN. Over this time some of the gear oil leaked out i assume due to a failed seal. On the way home the front differential became louder and louder especially when de-accelerating. Still driving it this way (it hasnt been quite a week ) but looking into get it repaired within the next few days.
front differential went out after I was initially told it was a bad axle. Repair cost quadrupled
sounds of crackling or like popping rocks under truck when started up and on acceleration but then on idle you cant rerally hear it
R front differential shot -
Expensive to fix....
Repair or replace
Front differential bearings failed on front drive
waiting on diagnoses. It definitely seems to either be differential bearings or the transfer casing
Vibration noise in drivetrain
At slow speeds or turning i hear this humming noise.
Both front wheel bearing replaced noise not gone.
All of a sudden started to make clicking scraping sound coming from passenger front but stops when applying brakes
Only hear sounds at 70+ mph. Fluid muddy and has metal shavings
Noise from the front end when I stop and go
Seal on front differential of denali
Have a 2002 trailblazer,4×4 hasn't worked since I've own it,I'm almost thinking differential is bad,makes loud howling sound,hubs r good,turn 4×4 switch on it only partially engages,the one thing I I don't know is the cv axle where it goes in differential has excessive up and down and side to side movement,any idea