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.
Problem DataRepairPal Verified
Average mileage: 145,061 (80,000–248,000)
Drive Trains affected: 2WD, 4WD
26 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!
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.