I think I might have had a similar sound, my gearbox sounded like straight cut gears LOL whines up and up it's awesome until I lost 6th gear on the track haha. Mine did it in all gears but so I'm not sure maybe just flush out your fluids and see how it goes make sure no chunks come out.
Not sure what the problem was but I've got a new gearbox and the sound has gone.
But yes as s2kjn said jack it up and drive it see if the sound is there.
FYS
My fake shit rocks!
Winton 1:35.4
Wakefield 1:07.87
i found out the problem could be needing a diff rebuild, so im out on the prowl for a second hand diff if not one thats been rebuilt and its a shame that aus had one and it sold!.
not sure if this helps.. when i had my s2000, there was no noise in the diff until i changed oil. when its cold, it would whine until the oil gets warm. but this was in all gears. wasn't sure if it was normal or not though lol
it did have a 4.7FD though
12.949 @ 107.71mph 2.063 60ft on Advan AD08 EKK20A 142.9kw on 98ron
mine also, did the oil and filter thinking i was abit low and didnt make a difference.. will be interesting too see what comes out of this thread seems to be an issue for a few people
gotta take the car to the mechanic and most probrably rebuild the diff although they have to open it up first so see how i go anybody know good shops they can refer for the diff rebuild?
When my diff was on it's way out I thought it was a problem with the transmission. Even rebuilt the transmission secondary before finding out the diff was stuffed. The sound can be deceptive.
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