Question about 1988 Chevrolet C1500

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High pitch noise.

88 chevy silverado 1/2 ton 4x4 350 TBI with 4 speed auto. The truck makes a high pitch noise at about 35 mph but stops if you let off the gas. Ive had the rear end rebuilt since the factor posi unit spider gears were destroyed (switched it with an alburn unit from randys ring and pinion). Changed the u joints also. I know its either the transfer case or transmission but im not sure which. The 4L60E was a GM replacement at 120,000 miles ago along with the motor. As far as I know the transfer case has never been serviced and I assume that is where the problem lies.

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  • dennday67 Sep 02, 2008

    Why would it go away when you take it out of gear when cruising if it was the belt?

  • dennday67 Sep 02, 2008

    Its not so much a high pitch noise as it is a howling noise like its rolling on boggers, it happened before and after i changed the tires. Its rolling on BFG all terrains 265/75/R16 that are new (less that 3k miles).

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Did you check that the noise it is not just the serpentine belt slipping on the alternator pulley.
In this case you fix it by replacing the serpentine belt or putting in tension the pulley arm.
The transmission usually does not make high pitch noises, rather scratching noise when it is faulty,

Posted on Sep 02, 2008

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This sounds like maybe a U-joint froze in one direction because it only make noise under load

Posted on Sep 02, 2008

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