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Old 07-29-2007, 06:26 PM   #1
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Rattling / Grinding

I am hearing a rattling / grinding (best way to describe it) durign acceleration. It only does it when I am moving, not when I put it in neutral and accelerate. This also usually only happens during low RPMs before it switches gears. Its an auto trans if it makes a diff. Anyone experienced this or have any ideas of what this could be???

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Old 07-29-2007, 06:44 PM   #2
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where does the noise come from? the tranny? the driveshaft? the front or the rear axle?
please try to locate it a bit better.


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Old 07-29-2007, 06:57 PM   #3
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so its not the engine revs that are the problem then, b/c it doesnt do it in neutral, and it vibrates on acceleration and on deceleration right before it downshifts?

go thtat right

okay seems to me that you may have some worn out bushings for your tranny mounr
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Old 07-29-2007, 07:41 PM   #4
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Debruins

Thanks for the reply, doesnt make any noise on the de-accelerate only on accelration, and your right, its not doing it during engine revs only when driving. Sound like worn out bushings still?
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Old 07-29-2007, 07:42 PM   #5
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Nicolas

I would be guessing if i had to say exactly where its coming from, since I can only hear it when I have the window down and the car is moving
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Old 07-29-2007, 08:23 PM   #6
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Does it do it while the transmission torque converter is in lock-up? In other words, when you get on the highway, and reach your cruising speed, the torque converter "locks up." This will seem almost like another gear in some vehicles. If you watch your RPMs, you will see a 200 or so RPM drop when this happens. This should occur in either direct drive, or overdrive, when a normal cruising speed has reached, not during decel/accel.

When the torque converter locks up, does this "grinding/rattling" still occur? Does it get any more severe or less severe? Is there any other way you could possibly describe the noise? Maybe a more common problem that has been diagnosed correctly, with the same sort of noise, so we can understand what its actually doing? You would be surprised at how some people describe a noise, and what it really ends up being
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Old 07-29-2007, 11:14 PM   #7
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I am pretty good at describing noises, but this one really baffles me on how to describe it. I really have no clue on how to be more specific about it. It doesnt do it when it reaches cruising speed. It happens like after a stop sign when you begin to accelerate, when I take my foot of the gas it stops, also when the car hits a certain speed / gear / or RPM it stops and there is no more noise and the car is fine. Its been hapening for about a month but progressively getting worse. I havent tried putting on the 4wd, and will experiment with that tomorow to see what it does in regards to the noise.
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Old 07-30-2007, 12:19 AM   #8
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Like a clicking type noise that sounds like its coming from right under you? Cause thats the noise I get when I start from a stop in first gear. It sounds like the same sound I hear, tho I have a 5 speed, and to me, it sounds like it is coming from the transfer case. I'll see if I can get a sound clip of it tomorrow
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Old 07-30-2007, 06:02 AM   #9
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naterg,

ya sounds like something like your describing
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Old 07-30-2007, 06:26 AM   #10
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You know I had this problem once in my Grand Prix. Turned out to be bad hanger son teh exhaust. When under acceleration, the motors torque would move the whole exhaust system til it would vibrate against the floorboards. It resonated so loud you couldnt think.
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Old 07-30-2007, 09:26 AM   #11
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Quote:
Originally Posted by Walkeraviator View Post
You know I had this problem once in my Grand Prix. Turned out to be bad hanger son teh exhaust. When under acceleration, the motors torque would move the whole exhaust system til it would vibrate against the floorboards. It resonated so loud you couldnt think.
I thought of that, but I don't hear it when I run over the rough stuff.
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Old 07-30-2007, 09:54 AM   #12
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dont put the t case in 4wd and drive on the road, youll ruin the tcase, its not mean to be a AWD system

but it could be something in the tcase then hmmm, so not tranny mounts and you dont think its exhaust?
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Old 07-30-2007, 10:01 AM   #13
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I have a sneaky suspiscion, that this is more serious than a mount or exhaust noise. I am thinking more along the lines of torque converter. With that said, It's hard to say over the internet. Maybe Mr.Cliff or Jerry B. or someone will chime in with advice on what to look for.
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Old 07-30-2007, 10:11 AM   #14
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Quote:
Originally Posted by debruins View Post
dont put the t case in 4wd and drive on the road, youll ruin the tcase, its not mean to be a AWD system

but it could be something in the tcase then hmmm, so not tranny mounts and you dont think its exhaust?
Who said anything about putting it in 4wd on the road?
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Old 07-30-2007, 10:12 AM   #15
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Quote:
Originally Posted by JCS05Rubi View Post
I have a sneaky suspiscion, that this is more serious than a mount or exhaust noise. I am thinking more along the lines of torque converter. With that said, It's hard to say over the internet. Maybe Mr.Cliff or Jerry B. or someone will chime in with advice on what to look for.
Well, considering it seems like he and I have the same sound, and I am in a 5 speed, that doesn't seem too likely.
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Old 07-30-2007, 10:15 AM   #16
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Quote:
Originally Posted by PATRIOT SPORT View Post
Rubi
I havent tried putting on the 4wd, and will experiment with that tomorow to see what it does in regards to the noise.
just making sure he doesnt skrew up his t case, and he knows not to go on road with it
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Old 07-30-2007, 11:08 AM   #17
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Have you checked the U-Joints?
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Old 07-30-2007, 11:23 AM   #18
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My '97 Sahara auto is doing the same thing. It only seems to happen when you start our from a stop and are going up a hill. Sounds almost like someone rattling marbles in a can. At first I thought it was pinging, but it's too loud and doesn't do it at any other time. As soon as it shifts into 2nd it's gone. I recently did the 60,000 mile transmission service, nothing remarkable there. The transmission mounts look OK and I can't see anything wrong with the U-joints or the exhaust. I would appreciate any ideas!
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Old 07-30-2007, 11:33 AM   #19
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Well, considering it seems like he and I have the same sound, and I am in a 5 speed, that doesn't seem too likely.
You are diagnosing a sound on the internet, based on a few key words. Its IMPOSSIBLE to say he has the same noise as you, and you have a stick vs auto over the internet.

There are way too many variables to say he has the same noise for the same reason over the internet, especially to dis-credit an idea before he can even test to see if its the bad part or not.

Torque converter is (in a nut shell, and simplified) basically a turbine, that spins off a shaft, turning liquid, which spins another turbine which spins another shaft. The faster they spin (higher rpms) the closer they get, until they "lock up" with a clutch at cruising speed. Granted, there aren't many parts to a torque converter, but they do go bad a lot, and think about the situations in which he hears this noise, and when he doesn't, and then decide if he should dis-credit the thought before even testing it There are bearings for the shafts, and many other items which could create a "grinding" or "Rattling" sound, as he describes, as well as many other things that can go wrong from bumper to bumper, causing a grinding or rattling noise at take off. All I am saying is, its very hard to diagnose a sound over the internet, and if he is asking for help, it wouldn't hurt to do a simple and quick check on the torque converter That's all
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Old 07-30-2007, 11:50 AM   #20
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Quote:
Originally Posted by JCS05Rubi View Post
You are diagnosing a sound on the internet, based on a few key words. Its IMPOSSIBLE to say he has the same noise as you, and you have a stick vs auto over the internet.

There are way too many variables to say he has the same noise for the same reason over the internet, especially to dis-credit an idea before he can even test to see if its the bad part or not.

Torque converter is (in a nut shell, and simplified) basically a turbine, that spins off a shaft, turning liquid, which spins another turbine which spins another shaft. The faster they spin (higher rpms) the closer they get, until they "lock up" with a clutch at cruising speed. Granted, there aren't many parts to a torque converter, but they do go bad a lot, and think about the situations in which he hears this noise, and when he doesn't, and then decide if he should dis-credit the thought before even testing it There are bearings for the shafts, and many other items which could create a "grinding" or "Rattling" sound, as he describes, as well as many other things that can go wrong from bumper to bumper, causing a grinding or rattling noise at take off. All I am saying is, its very hard to diagnose a sound over the internet, and if he is asking for help, it wouldn't hurt to do a simple and quick check on the torque converter That's all

Yeah they call that "chatter". I had that issue with my full size Bronco. I was in college living in a dorm and had to pay a guy to do it. I had em just rebuild the tranny since they were gonna charge me all teh labor to take out everything to get to the converter.

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