Help!!!!! Gearbox whirring noise.

[Steveb1980]

Hope someone can help with this.

I've had a 55 plate Monaro VXR 6.0 since May this year and have been getting a whining/whirring noise from the transmission tunnel area (I have already raised a thread on this ' http://www.pistonheads.com/gassing/topic.asp?t=140... '). The noise changes in pitch as engine revs rise and disappears when clutch is pressed or when stationary.

This last week I have had the gearbox taken off and inspected by a transmission specialist. The clutch looked like it had seen better days so I had this replaced with the LS7 unit along with the flywheel, spigot and also the propshaft centre bearing with hanger as the rubber bushing had perished. This did not remedy the noise so I had the gearbox taken out again and internals inspected.

Apparently everything in the gearbox is immaculate with no wear on any of the components and no abnormal noise from bearings etc. He did re shim the input shaft as there was play in it but no further action was taken. In a nutshell the guy could not fault it.

I have the car back and still non the wiser with my specialist scratching his head. The same noise is still there rising with revs but now it appears to be apparent at all times as long as the car is moving forward above 10-15mph (i.e. also when clutch is pressed and when coasting in neutral). When the clutch is fully depressed to the floor it sounds like there's a metallic scraping, not sure if this could be related.

I'm at a loss as to what to do next. I'm pretty sure it's gearbox related but as I've already spent a small fortune I'd like to see if anyone can throw any light on it before I get things pulled apart again. I feel I'm just throwing money at it at the moment.

Sorry for the long thread.

Thanks in advance and apologies for any poor spelling as I've done this on my phone.

Steve

[Steveb1980]

I can attempt a sound clip but not sure if the microphone would pick up the noise. Might give it a bash over the next couple of days.

[Steveb1980]

The noise can be heard in all gears. I'm inclined to say it can be heard more so in 5th & 6th at dual carriageway speeds as the engine is around 2k rpm. As it the revs rise it tends to drown the noise out a bit.

Will try to get a sound recording in the near future.

I just want to be as certain as possible next load of money i spend on it is going to put it right.

Thanks for replies so far.

[Steveb1980]

I'm in Shrewsbury, Shropshire. I've thought about getting it to monkfish but its about 2hrs 30 mins each way so would mean time off work etc. if anyone knows of a specialist local to me I'm open to suggestions.

Thanks.

[Steveb1980]

Black VXR said:

might be worth it in the long run - good luck - I assume you have checked the prop shaft centre bearing?

You may be right. I had the prop centre bearing replaced as the hanger support rubber had perished at the same time as the clutch etc. I was hoping those items would solve my problems but I've still got issues.

[Steveb1980]

Thanks, I'll certainly bear them in mind.

I've managed to get a couple of recordings of the noise although you may have to strain your ears a bit but it is audible (just).

First one is in 5th & 6th gear.

http://youtu.be/ehSu7ULhG6Q it changes pitch with rpm but the engine drowns it out at around 3k.

Second vid is in 3rd gear.

http://youtu.be/Ieuq0tOsCJU

Apologies for the shoddy camera work.

[Steveb1980]

To be fair it does sound a bit louder when driving. The microphone doesnt pick it up that well.

Can't hear it when stationary only when moving.

I've had a few mechanics in the car to see if they can come up with anything but nothing conclusive so far.

[Steveb1980]

Having never been out in another Monaro I'm unsure as to whether it is a 'standard' noise. I've had the gearbox stripped down by a specialist and he can not fault the internals.

I'll check the gaiter under the console to see if it's intact.

Cheers.

[Steveb1980]

Ok, thanks for the feedback people. I'll keep an eye on it for now and see how it progresses. If I do find what's causing it I'll post back on here. Hopefully it's nothing too serious.