Patrol Gearbox noise??

Sounds more like a thrust bearing if it stops when you put the clutch in

My GQ gearbox does the same.

Had the box out to replace flywheel and clutch and bearings about 3 years ago.

It is not a thrust bearing noise but a full blown rattle when cold. Sounds like there is a rock rolling around inside the box. Been like that for the past year. After while, when everything is warm, it goes quiet. Maybe a Nissan thing...lol. I just ignore it.


Cheers

I get a similar noise at idle when pushing in and releasing the clutch,
My mech told me to get the bearing done when i get the clutch done, that was four or so years ago still haven't done the clutch hehehehehehe. No ill effects at this stage

Craig

If this rattle sounds like the way Willem described it then it could be the same noise we used to hear in new 60 series diesel Cruisers when I was working on them years ago. The technical boys at Thiess Toyota, the State distributor for Toyota commercials, called it "roll over" noise and said it was caused by the clearance between the unloaded gears as they spun freely while the engine was idling in neutral. I can't remember it being a problem in petrol cars but it was very noticeable in diesels probably because it was amplified by the normal rattling of a diesel engine.

They said it was normal and would not cause any problems but it was very hard to convince some customers. One particular one would not accept it so Thiess authorised us to replace everything except the input and mainshaft. I rebuilt the box myself taking more care on it than I had ever done before but the noise came back halfway through a short test drive.

I have not worked on cars since those days so I don't know if later Toyotas, Patrols or anything else suffer from it.

There are a lot of things that can cause transmission noises but it is hard to work it out without hearing it.

Does the noise occur only in neutral while idling or can you hear it on the road? Will a slight touch on the clutch pedal stop it or do you have to push it right down? Does holding, moving or trying to lift the gear lever have any affect on it? If you can hear it on the road, does it get worse when slowing down in the lower gears while using engine braking?

It might not be a bad idea if you get two or three different opinions on it. I would not be too keen on getting too far away either until I knew exactly what it is.

Brian

Hi Craig - If all else fails, why not throw some AW10 in (this is also used in Mining and marine industries), from Brid Walker at CEM?
No connection - just a happy customer - but his stuff works.
CEM = Cost Effective Maintenance Web site is costeffective.com.au
Worth just ringing an having a chat............................Keith