Whining noise only in 4th & 5th.

[izanagi]

(09-24-2014 06:18 AM)jondee86 Wrote:  

(09-22-2014 04:33 PM)izanagi Wrote:  My 86 trueno is whining only in 4th & 5th gear but i can't hear if it comes
from, my first opinion, the gearbox or the rear end because this has new
bearings and if it would be the rear end it makes no differences between
gears.

If the noise remains the same when you change from 4th into 5th, then it
is very likely the the noise comes from the rear end. If it came from the
gearbox you would expect the pitch (frequency) to drop when you
changed from 4th to 5th.

I doubt if there is anything that can be done if the noise is the only
problem. My differential (which I consider to be in good condition) gets a
small amount of whining (ringing) under light load at higher speed, but only
at one particular speed. Above or below that speed it is quiet.

You may get some improvement by experimenting with different oils.
Otherwise, if the noise is just annoying, and does not make your ears
bleed, you may just have to get used to it

Cheers... jondee86

I have castrol 75w140 oil. Special differential.
My diff is setted up correctly and i would like to know why this noise.
The noise is at every speed and only in 4th & 5th.
I jacked up the car and tested it.