Question about Chevrolet S 10

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I recently purchase a 1986 Chevy S10 4x4 pickup with 91,000 miles. It runs great, shifts great (automatic), and everything works fine. However, there is a soft humming sound that increases in pitch with speed. I put it high 4 wheel drive and it does the same. I then went to the top of a long hill and coasted down in neutral. It still did it. I then coasted down the will with the 4 wheel drive shifter in neutral and it did not hum. I changed the fluid in the transfer case (it was not low) and did not see any shavings. The front hubs are automatic, not manual. Any ideas what is causing it? It is not real loud but is noticeable when the radio is off. - Thank you for any help!- TB

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You may be listening to a slightly noisy differential or the Tyre's....If they are off roader's they sometimes buzz....To check the diff keep it in gear and give normal gas when descending a hill and then, with the vehicle in gear lift your foot from the gas pedal....If the noise increases to any notable degree, its the diff....You can carry out the same test by disconnecting each of the shafts in turn and repeat the test....When testing the front diff, don't forget to engage the 4X4 drive or you wont go anywhere....You've said the sound is not high in volume, I'd think you can leave it...As an after thought have you checked the oil in the transfer case? Its not the same as the gear box and has a separate filler?.

Posted on Oct 16, 2010

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