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Old 12-19-2012, 12:26 AM   #1 (permalink)
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Unhappy 4 wheel drive setting rattling

I just got a 1990 model Suzuki sierra and i tried out the 4 wheel drive in the car and but as soon as i starting accelerating a loud rattling sound came from the under car think it was coming from the center, under neath would this be the axle? I am very unsure on the problem, anyone's in put would be very help full thanks.
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Old 12-19-2012, 07:39 AM   #2 (permalink)
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Is the rattle constant or does it change pitch or volume? If volume or pitch does change does it change with faster speed?
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Old 12-19-2012, 10:16 AM   #3 (permalink)
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The rattle is consistent it sounds loud and bad going at 5km/h and the faster i go the worse it sounds, got to second gear going around 25-30km/h it got louder so i backed off and stopped. The pitch doesn't really change but the volume dose the more i accelerate just gets louder.
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Old 12-19-2012, 07:44 PM   #4 (permalink)
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Transfer case mounting rubber might be the problem
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Old 12-19-2012, 11:56 PM   #5 (permalink)
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touch your toe on the clutch just a little bit while driving to put pressure on it but not disengage it..... if the tone changes or mostly goes away it could be the throw out bearing too. could also be lots of other things.
Just for a laugh here, a long time ago i wasn't paying attention and put the clutch disc in backwards and what a racket that made LOL
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Old 12-20-2012, 03:24 AM   #6 (permalink)
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Thanks jimmy ill have a look at my transfer case, im not sure what the mounting rubber is but i have my service manual so im sure ill figure it out, cheers.
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Old 12-20-2012, 03:27 AM   #7 (permalink)
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ill have to try that, also if its a bearing would that be easy to replace/fix?
Cheers Joe.
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Old 12-20-2012, 10:50 AM   #8 (permalink)
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A throw out bearing is a round bearing that slips on the clutch pedal fork in between the engine and the transmission..... If that was the problem you would pull the tranny out and reach inside the bell housing with your hand and slide the bearing off the fork and slide a new one in....it's simply a link between your clutch pedal and the clutch to engage and disengage the clutch....
Not sure that's your problem so don't just do it for the heck of it. while you have it apart if that's the problem you may want to put a new clutch and pressure plate......It would be a lot simpler if it was the transfer case mount like mentioned earlier.
Another thing to check after the transfer case mount is it could possibly be the left(drivers side) motor mount. with the engine not running feel your hand under the top side of the radiator fan shroud and see if it's all chewed up under there from the engine raising up caused by a broken motor mount on that side which could possible be your noise.
Joe
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Old 12-20-2012, 04:25 PM   #9 (permalink)
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You mentioned that this happened in 4WD. Does it make the same noise in 2WD?

If only in 4WD, then it would not be your transmission, clutch, throw-out bearing, or the intermediate shaft. That leaves you the front output shaft and bearings of the transfer case and the front driveshaft.

When in 4WD, what type of surface where you driving on? Asphalt and concrete will destroy the drivetrain in short order.

Last edited by Haptown; 12-20-2012 at 04:27 PM.
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Old 12-20-2012, 08:15 PM   #10 (permalink)
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Quote:
Originally Posted by Haptown View Post
You mentioned that this happened in 4WD. Does it make the same noise in 2WD?

If only in 4WD, then it would not be your transmission, clutch, throw-out bearing, or the intermediate shaft. That leaves you the front output shaft and bearings of the transfer case and the front driveshaft.

When in 4WD, what type of surface where you driving on? Asphalt and concrete will destroy the drivetrain in short order.
Your right...... I missed the part in the very beginning that said he was i four wheel drive
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