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Whining/humming coming from front end when locked in 4X4

Tiny
CYOUNGBLOOD1980
  • MEMBER
  • 1997 CHEVROLET SILVERADO
  • 155,000 MILES
I have a 97 chevy silverado 4x4, its making a whining/humming noise from front end when locked in 4x4 does it at highway speeds but seems louder when just in town around 35 mph. What could this be?
Saturday, November 19th, 2011 AT 9:47 PM

3 Replies

Tiny
BILLYMAC
  • MECHANIC
  • 2,204 POSTS
This could be low fluid level in the front differential. Could be worn pinion bearings or axle bearings.
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Saturday, November 19th, 2011 AT 9:50 PM
Tiny
CYOUNGBLOOD1980
  • MEMBER
  • 2 POSTS
Thanks! Whats should the fulid level be at in the front and how do you check a pinion bearing?
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Saturday, November 19th, 2011 AT 10:45 PM
Tiny
BILLYMAC
  • MECHANIC
  • 2,204 POSTS
Fill the front diff until it drips out of the fill hole. That is full
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Sunday, November 20th, 2011 AT 10:04 PM

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