Question about 2001 Chevrolet Silverado 1500

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2001 Silverado Buzzing/grinding noise behind dash.

I have 2001 Silverado with an ANNOYING buzz/grind. It worse when it's cold on startup. It seems to be some type of vibration that happens under load. It's an automatic. In 1st, under normal driving, the "grinding" is from about 800 to 1000 rpm, in 2nd and 3rd it happens when the tranny shifts up or down and the rpm is in that range.

If I'm stopped and in neutral, it makes the noise, but much softer. In gear with the brake engaged, it's loudest at about 900 rpm.

Any ideas what this could be. My mechnic said it could be just about anything which didn't help much.

Thanks for your help!

Rob

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 2920 Answers

SOURCE: when shifted to any 4wd position it will not engage

you may have a bad transfer case

Posted on Jan 12, 2009

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  • 2 Answers

SOURCE: 1996 suburban makes grinding noise in 2 wheel drive

sounds like the clip on the rear output shaft its probably broke. do this by removing the rear driveshaft, and the tail of the transfer case, there are 4 bolts holding it in place. then grab the output shaft and see if it has any front to back movement. if so pull it all the way to the rear and you should see a groove at the front part of the shaft where the clip goes. Then you should find the pieces fo the clip in the tail housing. One person said he found the replacement clip at a local tranny shop. I am calling the dealership parts counter for a new clip for my 97 Tahoe tomorrow. Hope this helps..

Posted on Mar 15, 2009

Molson02536
  • 3854 Answers

SOURCE: s10 blazer tansmission

You have a 4L60E whick is controled by your ECM. It sounds like you need and new transmission, the sun gear in it has failed and is the weak point on this transmission. 
When you get a new transmission have them to a corvette servo upgrade. The part is only $45.00 and the shop should know about the upgrade. It will make your truck shift a lot more firmer but last longer. 
Here is a write up http://s-series.org/component/option,com_tech_article/Itemid,/item,6/task,item/
Good luck and hope this helps

Posted on Apr 09, 2009

csmock132
  • 4669 Answers

SOURCE: 1997 Suburban 4x4 5.7L Transmission whines until it shifts

You rear planetary set is worn from a restricted cooler.

Posted on May 06, 2009

Molson02536
  • 3854 Answers

SOURCE: 4l60e slips in 3rd and 4th

There are to many things that can cause this problem, best thing to is go get the ECM scanned for DTC codes at a transmission shop or Auto zone or Parts Source since they scan for free.
The ECM should have DTC code in it's memory on how the transmission is Performing and have the Transmission line tested for Fluid pressure.
Good luck and hope this helps. Oh and also ways check with more then on transmission shop if there tell you that you need a new Transmission,
It could be a simple as the transmission filter falling off causing the lost of transmission fluid pressure. Check the transmission fluid too.

Posted on May 07, 2009

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