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Whining sound in four wheel drive

Tiny
ZACH HUSKIN
  • MEMBER
  • 2004 CHEVROLET TAHOE
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 158,800 MILES
No strange sound in two wheel drive. But in four wheel drive it sounds like a deeper whine than what you would have of you had no power steering fluid. Happens as you turn and when you return the wheel to its center position. Turning left and right.
Thursday, March 19th, 2020 AT 9:05 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,758 POSTS
Does it only happen when turning? Are you sure it isn't the power steering pump? Also, have you checked the fluid in the differentials and the transfer case?

On the back side of the transfer case, you will see two plugs. One is higher than the other. Remove the top one and the fluid should be to the top of the bottom threaded opening.

The best picture I could find of the fill plug is attached. Don't remove the lower plug. It is a drain. I circled the plug to check. It requires a 3/8" ratchet to remove. I always put an extension on the ratchet to make it easier.

If you remove the front differential fill hole plug, it is full based on the same principals.

Let me know what you find.

Joe
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Thursday, March 19th, 2020 AT 10:43 PM

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