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Old 01-07-2012, 06:18 PM   #1
Rick.L.
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Have a Nice Day? Transmission knocking noise.....?

Hey everyone, new to nasioc and having problems with my WRX, nothing terrible yet but need help. Ok so not to long ago I replaced the clutch on my 06' wrx. After driving it a while I started hearing a knocking noise. I read all the other posts but others seem to be having a grinding noise. I also did a gear oil change when doing the whole replacment. The noise can be heard right by the shifter, I thought it was the shifter being loose but that wasn't it and ran out of ideas as to what it could be. Is it possible that the car needs more gear oil?

Thanks Rick
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Old 01-07-2012, 10:08 PM   #2
Elbert Bass
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Does the trans dipstick say you need more gear oil?

Take a look at the rear end of the tranny - either you left the rear trans support loose or that support is worn/damaged/broke.
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Old 01-08-2012, 11:12 AM   #3
Rick.L.
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I did check the dipstick and it looked ok, the support was not broken when i checked, but a second look couldn't hurt. But if that is the case, then why do I hear the noise right at the shifter?
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Old 01-08-2012, 11:40 AM   #4
davidmount
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Is the clutch engaging normally? Oh and if a transmission mount isn't secured or loose, you'll probably hear it by the shifter from vibrations along the housing.

Last edited by davidmount; 01-08-2012 at 11:41 AM. Reason: added
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Old 01-08-2012, 07:58 PM   #5
Rick.L.
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The clutch engages fine, I'll just remove mount and re-bolt them carefully and make sure their nice and tight.
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Old 09-08-2020, 10:21 AM   #6
DaveRosario
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Reviving this old thread...

I'm having the same issue on a 2014 WRX I just rebuilt the engine and installed a new ACT clutch and street light flywheel. Now the cars does a knocking noise that it looks like is coming from the center of the transmission.

Did I mess something up?
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Old 09-08-2020, 12:17 PM   #7
Jack
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Did you replace the flywheel? If you did, are you sure you used all the correct bolts? If you did, did you measure the flywheel thickness where the bolts go through? If it were slightly thinner, a bolt could be hitting against the block. If that's it, the noise will change with RPM.
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Old 09-08-2020, 12:31 PM   #8
Elbert Bass
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Did you leave the bolts for the driveshaft carrier bearing or rear cradle mount loose? Pry on that rear trans mount - just looking won't tell you if its bad unless it is completely demolished. It could even be the front or center joint in the driveshaft. Removing and installing the shaft/transmission shifted a worn spot and now it's noisy. Oh yeah - make sure your front axles are fully seated in the front differential.

If all that looks good does the noise increase/decrease with road speed? Faster or slower in different gears?

Last edited by Elbert Bass; 09-08-2020 at 12:37 PM.
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Old 10-21-2020, 01:39 AM   #9
DaveRosario
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Update:

Thanks Elbert and Jack for the reply.

So I took the engine out and inspected everything. It turns out the knocking noise was the up pipe heatshield loose. The heatshield welds cracked and it was hitting the exhaust pipe. I welded it and installed the engine again.

But the transmission still does a rattle noise only when Idling, A/C ON, in neutral and with the clutch pedal up. If I press the clutch pedal down it goes away completely. This happens because I installed ACT clutch kit with a light weight flywheel, and as per ACT it's just gear rattle.

The other noise I'm noticing is under the shifter, it sounds like there is something loose under there. I'll post another update when I figure it out.
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Old 10-21-2020, 01:42 AM   #10
DaveRosario
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Quote:
Originally Posted by Jack View Post
Did you replace the flywheel? If you did, are you sure you used all the correct bolts? If you did, did you measure the flywheel thickness where the bolts go through? If it were slightly thinner, a bolt could be hitting against the block. If that's it, the noise will change with RPM.
Yes, I installed an ACT clutch kit with a light weight flywheel. I used new OE bolts with the flywheel and the clutch plate.

The noise only happened when stopped/Idle. The car drive and switch great. No noise while driving.
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Old 10-21-2020, 01:43 AM   #11
DaveRosario
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Quote:
Originally Posted by Elbert Bass View Post
Did you leave the bolts for the driveshaft carrier bearing or rear cradle mount loose? Pry on that rear trans mount - just looking won't tell you if its bad unless it is completely demolished. It could even be the front or center joint in the driveshaft. Removing and installing the shaft/transmission shifted a worn spot and now it's noisy. Oh yeah - make sure your front axles are fully seated in the front differential.

If all that looks good does the noise increase/decrease with road speed? Faster or slower in different gears?
Thanks for the Idea I'll probably remove the transmission and inspect everything. Thanks.
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