Having some issues pinpointing a whining sound that seems like its coming from under the hood. The sound varies with rpm, but I don't see a lack of power rowing through the gears. So far I have checked the power steering fluid level, replaced idler puller, bypassed the a/c compressor with a new serp belt. The truck has 220,000 on it, stock p-pump.

I did not notice the whining sound until after I put a push-pull lever in place of the fuel shut off solenoid when it went bad. Any info would help before I started taking nuts and bolts loose. Thanks

 

So I did some more investigating today driving down the road. While cruisin I pushed in the clutch and the noise faded away. Depress the clutch and there the whining noise is again. I know its a bearing but has anyone had an issue like this around this mileage with a nv4500?

 

I've heard 5th gear nut is prone to back off, especially when the truck has been used to pull its whole life. Look into that subject, maybe it'll help you diagnose your problem.

 

you know its funny i keep hearing this noise couldnt figure it out, (probably nothing to do with your issue but)... it was my sliding window in the back was a little bit open closed it and it went away....

 

Hey everyone, found out what the noise was. . . the simple principle that sound travels through pipe, hence the fuel shut-off cable I installed. Mounted it on the hydra-boost assembly and all vibration went away.