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03 Yukon Oscillating Noise
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Question
03GMCYukon
2003 GMC Yukon SLT, 2WD, Auto, 135K miles
My Yukon has an oscillating noise coming from the driveline. It's my son's vehicle in college so trying to determine if there is a safety issue and if I should pay the $100 diagnostic fee at the dealer to figure it out for sure.
Noise characteristics are:
- noise varies with speed of vehicle. Noise isn't grinding or tinny. Kind of sounds like rrrrr, rrrrrr, rrrrrr with each noise occurring at 1X per wheel rotating.
- slight acceleration makes the noise go away but braking does not affect the noise
- 10 to 25 mph, coasting, is when noise if most present
- turning left or right will make the noise go away
- putting trans in neutral has no effect
I bought the vehicle with 3 miles on odo so know the complete history. Arizona vehicle. Brakes have not been changed (6mm remaining) as it's flat in Arizona and I do a lot of freeway traveling. Tires are almost new and were just checked with nothing notable. Rear diff fluid changed at 98K at Chevy dealership. Just had front end aligned when changed the front upper A arms (ball joint boot was split open)
Here are my two cents on possibilities:
Engine - no, as noise varies with vehicle speed not engine speed
Tranny - unlikely given that putting trans in neutral doesn't have an effect on the noise
Axle joints - not sure
Diff - not sure
Rear bearings - not sure
Front/Rear tires - seems unlikely given they were just checked and relatively new
Front/Rear brakes/rotors - not sure
Front wheel bearings - not sure but turning or slight accel causing noise to go away seems odd
Any experience to help point me in the right direction? Thanks.
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