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Old 07-15-2010, 09:17 AM   #1
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Default Increased noise with polyurathane diff bushings

I swapped in a rx-7 diff housing on my wifes 97 after being rear-ended. I have noticed that there is a lot more gear whine above 55mph. Is this normal for doing the bushing swap? I am just trying to make sure there is nothing else wrong with the diff or drivetrain. I am fully aware of the fact that the stiffer bushings wil not damp out the vibration and noise that a ssofter rubber bushing would.
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Old 07-15-2010, 09:34 AM   #2
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I have more whine after putting in the poly bushings too.
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Old 07-15-2010, 11:19 AM   #3
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same here, it sounds grate.
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Old 07-15-2010, 11:33 AM   #4
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I also have the *** tingling at 3k rpms with the MMRs.
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Old 07-15-2010, 12:06 PM   #5
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Was the same on my NA as well.
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Old 07-15-2010, 12:26 PM   #6
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Good deal! I mean it sucks for my wife but at least I don't have to worry that something is messed up. I will be putting these same bushings on my 91 once I get the torsen swapped in. Luckily my wife mostly drives it around town at less than 55mph where it seems to be quiet. I drive at 60-65 for most of my 35 mile trip to work and it has been driving me crazy for the past few days. Hopefully the 91's exhaust will mask the diff noise.
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Old 07-16-2010, 01:20 PM   #7
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I noticed a lot of whine when I did the swap too. Mostly from my wife though. "You work on that car too damn much".

Yeah, the car's a little noisier too. Less rubbery though so it's a trade off.
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Old 07-16-2010, 04:23 PM   #8
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I noticed the whine also... but I have another question I don't think I want the answer to.

After the diff bushings I noticed a bit of what feels like excessive gear lash maybe? If I let off the gas, then get on it there is a bit of a tap noise. Sounds like there is too much space between the gears and when it switches faces it hits with a bit of force. Is this normal or a sign something is effed? I figured maybe it was the lack of dapening in the drivetrain allowing me to hear it.

Here is the catch.. it's a Kazz diff. I had heard they have a lot of lash built into them. I know they make A LOT (and I mean A LOT) of noises already, but this one worries me.
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Old 07-16-2010, 05:27 PM   #9
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if its not diff noise, then it might be the driveshaft u-joints (it's thats still what they're called). mine wore out and started making a sound like that. later it caused a vibration. bought another and the sound and vibration were gone.
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Old 07-16-2010, 09:30 PM   #10
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I'm just so ******* deaf from all the gear noise I don't whine anymore...
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Old 07-18-2010, 03:33 AM   #11
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Quote:
Originally Posted by miatamania View Post
I also have the *** tingling at 3k rpms with the MMRs.
This. Feels like the car is shaking itself to pieces at a certain rpm on decel.
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Old 07-28-2010, 03:14 PM   #12
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so its not a good idea to replace the bushings? or is there something that isnt as noisey
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