hi there!

i would appreciate if anyone here knows whats happening to my datsun b310 a12 5 speed. its 4th and 5th gear produces a 'wuuuuuu" like noise at speeds around above 50kmh and the pitch gets louder as the speed increases in both gears. the 1st, 2nd and 3rd gear doesnt have this noise...even at 50kmh on the 3rd gear...

it has been going on for years even before the ride was handed down to me few years back and now its annoying me alot when i travel down the highway....i always need to blast the stereo to get rid of that noise

thanks guys for your answers