This is a 2012 Yukon Denali AWD, has 122K miles. I bought it with 85K and it was well maintained, but unsure of diff fluid changes. I'm fairly certain it's the 8.6" rear.
When I bought it, I changed both diff fluids and transfer case fluid. About a couple months after the purchase, I replaced the tires, they were worn and slightly noisy.
Maybe they covered this up, but there was a very, very faint driveline noise under load above about 50 MPH
The area around the rear pinion was moist but not wet, there was light spatter on the floor pan above the pinion, but no drips.
About 6 months later I noticed about 5 drips or so per night under the rear pinion and then soon after replaced the rear pinion seal.
I have since replaced both front hub and bearings, both motor mounts, trans mount, and both front diff brackets, new U joints and both driveshafts balanced. U-joints are Spicer and pivot very freely.
I needed to replace all that anyway, but the driveline noise is definitely more isolated.
This sound has a very slight, low intensity sine wave like noise. Starts low then rises then quickly dissipates. Almost like when the ring and pinion teeth meet back up, about every 1.5 seconds at 60 MPH.
This is only under load and not coast. If the radio is on you can't hear it...you have to know it's there,
Could this be excessive backlash? If so, can that be corrected without damaging the teeth, or is this more of a pinion bearing or carrier bearing noise?
All input appreciated.
When I bought it, I changed both diff fluids and transfer case fluid. About a couple months after the purchase, I replaced the tires, they were worn and slightly noisy.
Maybe they covered this up, but there was a very, very faint driveline noise under load above about 50 MPH
The area around the rear pinion was moist but not wet, there was light spatter on the floor pan above the pinion, but no drips.
About 6 months later I noticed about 5 drips or so per night under the rear pinion and then soon after replaced the rear pinion seal.
I have since replaced both front hub and bearings, both motor mounts, trans mount, and both front diff brackets, new U joints and both driveshafts balanced. U-joints are Spicer and pivot very freely.
I needed to replace all that anyway, but the driveline noise is definitely more isolated.
This sound has a very slight, low intensity sine wave like noise. Starts low then rises then quickly dissipates. Almost like when the ring and pinion teeth meet back up, about every 1.5 seconds at 60 MPH.
This is only under load and not coast. If the radio is on you can't hear it...you have to know it's there,
Could this be excessive backlash? If so, can that be corrected without damaging the teeth, or is this more of a pinion bearing or carrier bearing noise?
All input appreciated.