Rear end humming

[supra1642]

when i'm at about 3k rpm i can really here a hum in the back only when i'm on the throttle. what is causing this? is it a bearing in the axle? any help is greatly appreciated thanks.

 

[Fletch124]

Does it still make the sound if you put it in neutral at about 3K?

 

[TooGoode]

youre center driveshaft bearing is about to take a shit.....

 

[theKnifeArtist]

i'd be leaning more to differential failure. mine ran low of oil and then sounded just as you described. i swapped it.

 

[TurboWarrior]

3k rpm in any gear? Can you feel the hum? Like fletch said, does it do it at idle or crusing in neutral?

 

[suprasnd]

I know why it hums!! :icon_bigg


Nobody ever taught it the words!!!:icon_bigg

Just joking. Mine rear whines like that. Never ever checked it out!!!

keith

 

[supra_ed]

i'd be leaning more to differential failure. mine ran low of oil and then sounded just as you described. i swapped it.

thats wat i think. also make sure u put the right oil in it- for lsd rears

 

[supra1642]

well it leaks in two spots and i filled it with 90 weight gear oil so its not empty but so far its looking like the bearing by the driveshaft... at least from what i've been told. no when i back off the throttle or have it in neutral it doesn't hum.

 

[TurboWarrior]

Filled it with oil? Was it for LSD's? You need an additive in there you know.

 

[supra1642]

the stuff i put in there is whats supposed to be in there i don't remember exactly what it is but its for lsd's

 

[supra_ed]

use royal purple or lucas or oem toyota- all these r for lsd

 

[TurboStreetCar]

Is is RPM dependent or Speed dependent? how about deceleration?

 

[jdub]

For a high mileage LSD...Ford 75W-90. You'll have to add some Ford friction modifier.