Question about 1999 Chevrolet Blazer
Sounds like the rear diff is causing it.
Check rear pinon for it being loose which means the bearing is worn out.
To check it make sure the truck is in park & can't roll then go under the truck to the rear diff and grab the drive shaft close to the rear diff and try to move it up and down, there should not be any play in it. If it does the rear pinon bearing is gone and needs to be replaced before it breaks.
If there is no play it may be internal rear diff problems ..
Note: If you go off roading keep in mind even that your diff's looks sealed but there not and will get mud/water into by the breather tubes causing damage. Make sure all diff's are flushed after off roading.
Posted on Feb 07, 2012
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Posted on Jan 02, 2017
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