"roaring" noise in the rear end of my 1998 mustang - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-25-2004, 08:53 PM
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"roaring" noise in the rear end of my 1998 mustang

I have this "roaring" noise in the rear end of my 1998 mustang gt. I have changed the back brakes and it didnt help. I dont think the calipers are sticking since they were hard to push back in. Any suggestions? bearings? axles? gears?

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Old 12-25-2004, 09:01 PM
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IF it roars all the time the car is in motion, suspect bearings. If it roars on acceleration but is relatively quiet on cruise and deceleration, suspect gear teeth. If bearings, it can be axle bearings (check by pulling the axles), or differential bearings which requires pulling the differential. Less likely but also potential is pinion shaft bearings which requires pulling the whole carrier apart.
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Old 12-26-2004, 01:18 AM
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Did you actually force the piston back into the rear calipers or did you turn them in.On rear calipers the piston works like a screw.If you push them straight in like on a front caliper than you can damage the caliper/piston.Making replacement of the caliper Assembly necessary.
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Old 12-26-2004, 07:21 AM
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I'm with Willys36. The main suspect in my opinion would be the wheel bearings. Had the same problem on a '69 Mustang a few years back.

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Old 12-26-2004, 07:33 AM
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Have you jacked it up and turned the wheels?

Troy
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Old 12-26-2004, 12:10 PM
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Quote:
Originally posted by troy-curt
Have you jacked it up and turned the wheels?

Troy

ya , it turned freely.... it gets louder as you speed up, the faster you go the louder it gets....
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Old 12-26-2004, 12:53 PM
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Arrow

While it is most likely in the areas already covered, I have to ask, does it make the noise from initial take off or does it take a few minutes to occur? The reason for asking is that I diagnosed a similar problem several years ago and the noise sounded like a Jet landing on the roof of the car, but it took a few minutes before it started and got worse as you drove. It turned out that the muffler had rusted inside and after it was shut off the rust pieces fell back out of the exhaust flow. When you took off it would start churning the rust flakes up until they blocked the passages and created a very loud roaring noise. If the other areas don't resolve the problem that might be worth looking at.
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Old 12-26-2004, 01:57 PM
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jeeeesssss, this is a tough one. Did you rotate each back wheel by hand while it was jacked up? This would show a bad wheel bearing, if thats what it is.

There is no way anyone can tell you what is wrong with out checking it first.

Troy
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Old 12-26-2004, 02:17 PM
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im going to take it in monday, but i just wonted to know some about it befor i just say "here it is fix it " cuz they could say it was anything and i would have no clue ? and this is going to be a big $$$$ for me to do....
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Old 12-26-2004, 05:47 PM
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Arrow

Because of the dearing style used on the 8.8, which is completely different from the earlier 8 and 9" rears, a bad axle bearing may not make any noise when it is rotated with the wheel off the ground. Without any load/weight on it they can rotate fine while still being bad. On those it is best to visually inspect the axle and bearing since the axle is the bearing surface. With a loud growl the axle would probably be showing some strange wear. I have also experienced the ABS causing problems, although it was at low speeds, because the sensors were bad (at least one) and it was activating the brakes in a pulsing manner as you drove at low speeds in a parking lot. Sounded like carrier bearings at first, but a little diagnostics pinpointed the pulsing brakes.
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Old 12-26-2004, 08:14 PM
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Reminds me of a bad axle bearing I had on the Willys once. Just returned from a 500mi round trip to Good Guys Pleasanton sow when I heard the nasty roar. Put up with it for a couple of days then decided to track it down. I thought it was coming from the front so checked both front bearings, they were fine. Then checked pass side axle bearing, it was fine too. When I pulled the driver's side axle out, all but three balls from the axle bearing dropped out on the floor. There was NOTHING inside the bearing except three equally spaced balls that were keeping the axle in! Cheap lesson to not let the growl persist!!
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