diff whine ?????

[mopper]

I bought my 2002 3.0l DT 4 weeks ago, 250000KLMS. Now It has just started emitting a high pitch whine when I hit 95 klm hr. , this noise seems to be coming from front RH .It stops as soon as I take foot of accelerator and starts again as soon as I put it on again. Is this a sign my diff is on the way out , or what else could it be ? hopefully something less expensive??? your thoughts please...

[threedogs]

Maybe Egr pipe leaking , Does it sound like exhaust leak , don't think its your diff
Loose belt, Have a look under the bonnet see if all looks right, Can you replicate the sound standing still

[megatexture]

Drop the diff oil and look for bits of metal in it and on the plug

When my diff went it was more of a low pitch droning sound that left when under power and was more noticeable coasting than cruising

[threedogs]

What made you think it was your Diff????

[93patrol]

it wouldn't be from your front diff unless your hubs are locked in constantly but i still dont think it would whine as its not under load i reackon its your thrust bearing or maybe a uni joint

[mopper]

im a bit deaf (a lot being a boilermaker) so not 100% sure where sound is emanating from defiantly a high pitch whine. Realise now it shouldn't be front diff but somats not quite right .Thought it was diff due to the noise stopping as soon as I took foot of accelerator and coming back when I put it on again. Gonna get a mechanic to give it a full service and check all out.Was told it had been given a full service before buying it ....but for pice of mind I think I should....any good 4x4 mechanics in Redlands qld ?

[megatexture]

http://www.nissanpatrol.com.au/forums/showthread.php?15844-servicing-in-bris..
Scotty(bigrig) recommends autoart but its a bit out of my way but prity local for you

[menace 2]

it wouldn't be from your front diff unless your hubs are locked in constantly but i still dont think it would whine as its not under load i reackon its your thrust bearing or maybe a uni joint

do stuffed uni's whine ???

[93patrol]

More have a squeak that is high pitched and annoying. It sounds like your brakes are stuck on slightly


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[threedogs]

Uni's hum , I'm not convinced its a diff
could even be a bearing in your belt tensioner
Be interested in the out come, hope not too painfull
I take it you brought private,??

[mopper]

Thanks for all the advice, Thought it may be brakes or brake dust ,but I've discounted that now , Think I may have not fully disengaged 4 wheel drive auto lock, had a bit of a play , and on the few times I managed to get a clear run to get up to 95 klm I couldn't hear the whine ( though I am a bit deaf!). will get it checked out for sure auto art sounds good thanks MT .Think it may be a case of me being new to the 4 x 4 world and the Patrol. Hope so , it wil be cheaper than a new diff!! I will let you know the outcome . Thanks again.

[mopper]

Had another look under Patrol as whine is still there at 100 klms, I can only turn the front prop 1/4 turn by hand , does this mean it is locked in ?

[93patrol]

Jack your front wheels of the ground and then try turning your prop shaft discount your hubs first as it cheaper than your transfer case to rebuild.


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[megatexture]

At least you had a crack yourself. sometimes these noises can be bloody hard to find, specially when they are high speed noises.