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Old 09-23-2006, 11:52 PM   #1
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Join Date: Oct 2002
Default Crude Transmission Deceleration and Acceleration Noise after Clutch/Flywheel Install

^ Video of the noise. "The deceleration noise" is best heard on video with the windows up.

Recently, i've done a clutch/flywheel job, and noticed that after the install, i've gotten a bad rattle noise that seems to be much worse then the original "subaru deceleration noise" that has been discussed to death.

This is on a lightly modded 04' WRX with ~69k. After a few years, i've had the noisy in-gear deceleration as thousands of other subaru owners do. I recently changed the stock clutch with an OEM style Exedy replacement kit, and a 10lb Cusco flywheel. Installed a new throwout bearing, pilot bearing, clutch disc, and pressure plate. Everything was torqued to spec, cleaned, and lubed according to the manual.

Now, I get a distinct, very loud rattling noise that occurs during in-gear off-throttle coast situations, somewhere above 1800rpm. It kind of sounds like a bolt is loose.

I do remember having a little problem with separating the engine and transmission bellhousing though, as I was a lazy bastard and somehow managed to move the engine forward instead of dropping the transmission. Did I flex the input shaft too much while trying to pry the engine from the transmission? I know a lightweight flywheel will cause more NVH but the noise is quite loud and obnoxious; it is very hard to ignore.

The best description I can come up with, is as if something rotating is rattling or contacting where it shouldn't.

Any insights would be appreciated.

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Last edited by caterpill; 08-05-2017 at 06:24 AM. Reason: Grammar
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