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My 1998 GMC Sierra 1500 5

Tiny
S_3WATSON
  • MEMBER
  • 1998 GMC SIERRA
  • 109,000 MILES
My 1998 Gmc Sierra 1500 5.7l 350 has 109000 on it. The dealer I bought it from tells me the brakes have been done and it has new upper and lower intake gaskets. It is now making a loud screeching noise from the rear end. It get louder with the speed of the vehicle and when it has pressure going down hill. The noise definitely doesn't fluctuate with rpm. It gets worse with the speed of the vehicle and when it has pressure from accel/deceleration. Any ideas on what this problem may be. I placed the vehicle on jacks and put it in neutral to turn the wheels. They spin freely and silently. Doesn't seem to change with lane changes/hard or slight turns. Always the same sound no matter what direction. Leeds me to believe it is not the wheel bearings.
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Thursday, March 14th, 2013 AT 12:17 AM

4 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
It sounds like the pinion bearings in the differential.

Roy
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Thursday, March 14th, 2013 AT 12:25 AM
Tiny
S_3WATSON
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  • 3 POSTS
That what I thought. Any idea on how much the average shop would charge? And how long it usually takes.
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Thursday, March 14th, 2013 AT 12:49 AM
Tiny
ASEMASTER6371
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6 to 8 hours

bearing kits are about 150-200.

Could be more if there is more damage
Roy
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Thursday, March 14th, 2013 AT 12:52 AM
Tiny
S_3WATSON
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  • 3 POSTS
Ok, everything that I suspected. I don't have the time to do the work myself so it sounds like it's gonna be a pricy one. Thanks for your help.
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Thursday, March 14th, 2013 AT 1:01 AM

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