Question about 1999 Chevrolet Blazer
As soon as I start moving at about 15mph or so you hear the noise. It is really loud at about 45-55mph. Even when you do about 35mph and then let off the gas to coast down you'll hear it loud and clear. Not sure if it is the transfer case or the rear differential
Are you sure its not a wheel bearing? does the noise change if you take a corner to the left or right?
Posted on Apr 30, 2013
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Posted on Jan 02, 2017
One thing to check, which is often the culprit in these situations is the U-joints. With the truck off, crawl under the vehicle and grab hold of the shaft leading into as well as the shaft going out of your transfer case, If htere is a lot of "slop in it, chance are it is in need of repair. Also I would check the oil level in the transfer case, in an attempt not to challenge you intelligence, there should be a plug located in the lower part about 2 inches from the bottom or so. it usually has a square hole that a 1/2" ratchet fits into. Pull the plug, and stick your pinky into the hole, you should be able to feel the lubricant just below the hole, if not it is in dire need of a filling. also check for metallic remnants in the fluid. this is a sign that things are not as they should be. In that case contact a repairman for a more thorough look.
Posted on Jul 13, 2009
i had the same problem.. it is the vacuum switch on the transfer case. the switch is stuck open and supplying vacuum to the vacuum diaphram under the battery box. the switch is located on the upper side of the transfer case ( not the front differential) which is located driver side of the transmission. the switch cost me about $25.00. I replaced it myself. if you do your own mechanical work you can get it done just be patient.
Posted on Dec 09, 2008
Common noise heard when the brake pads are getting close to the end of its life and will need to be replaced. Replace the brake pads and rotors since the rotors are not that expansive, might as well replace them also.
Good luck and stay safe, thank you for using fixya.
Posted on Oct 23, 2011
Driveline and wheel bearing noises can be very decieving. - especially on 4X4 vehicles. These noises can travel through the vehicle and sound like they are coming from one place when they are caused by something else. I have 2 recomendations:
1. Take it to a professional that deals with 4X4 drive trains and have him lend you an ear.
2. get the thing on a lift and listen to the components with a stethescope. It could be a wheel bearing, a differential, a transfer case, or even the transmission making a noise like you have described.
Posted on Mar 06, 2011
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