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Chevrolet Blazer Noises and Sounds

176 messages,  Last post on Nov 04, 2009 at 2:48 PM

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#174 of 176 Rubbing noise coming from rear end at low speeds by dart09 Oct 26, 2009 (4:10 pm)
I have a '99 Blazer LS 4X4 -- 159,000 miles (I know, woe is me). lol. Anyways, I have a rubbing noise that starts when the vehicle moves and seems to go away for the most part as I get up to highway speeds. It is more noticeable at low speeds. At first it sounded like it was coming from the right rear. I put it up on jack stands and the noise then seemed to be coming from inside the differential. I checked the pinion by hand for play and there is none. I then took the dif cover off and discovered someone had drilled a hole near the top center of it apparently so they could add fluid there? It had a black plastic plug in it. Yikes! Who worked on this thing before I bought it? Curly or Moe?    I've put in new front hub bearings, new u-joints on the rear drive shaft, new rear wheel bearings and seals and new rear brake calipers and disc pads -- the back plates are rusted away making the rotors visible on both back wheels. Will it hurt to leave the rusted away backplates as is? I also installed a new rotor on the right rear and had the other three rotors turned. There are no broken belts in the tires. When I changed the rear wheel bearings I didn't see any metal shavings from the spiders or from the pinion gear. There were no broken teeth on any of the gears. I also noted at the time that there were two shims on each of the spider gears. Does that sound right? It is a GU6 / 3.42 rear.   I am at a loss as to what is causing the rubbing noise and would greatly appreciate any help I can get on this. Thanks in advance! -Dave
#175 of 176 1998 Chevy Blazer 4X4 rumbly drivetrain by ripley09 Nov 04, 2009 (9:21 am)
I have a 1998 Chevy Blazer 4X4 and when i hit 45-55 mph i get a horrible growl/rumble (sound and feels like you hit the caution rumble strip on the road) from somewhere in the drivetrain. i have replaced the rear end barrings, took out the front drive shaft, replace the 4x4 drive vacuum pod. The problem didn't start till i put the new tire on it (goodyear ranglers). The issue only last for 3-4 second but it reacurres ever 30 second or so. If you speed up or slow down the sound/feeling goes away. If anyone has had or know what may be wrong with it I would greatly appreciate some advice because i am totally stumped. i have look over everything i can think of. Replies to this message: carmanghia (Nov 04, 2009 2:48 pm)
#176 of 176 Re: 1998 Chevy Blazer 4X4 rumbly drivetrain [ripley09] by carmanghia Nov 04, 2009 (2:48 pm)
Replying to: ripley09 (Nov 04, 2009 9:21 am) I hate to tell you this but it is probably your tires causing this noise. I had a similar experience when I purchased new Goodyear Wranglers. I learned that there are many different tire designs all under the Wrangler name. The tire store had put on an All-Terrain design on. Anyhow, I didn't even make it home on these new tires as the noise was so objectionable.   I had the tire store pull the Wranglers off and put Toyo tires on instead and they ride nice and quiet. Hope this helps.

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