Engine/Transmission (1998.5 - 2002) Haunted cummins

[KFranco]

It's only fitting with halloween around the corner that my truck just started making weird noises. Atleast... I haven't heard them until now. There are two noises coming from the engine compartment area.



1. A high pitch humming sound that you hear only while accelerating to cruising speeds and while accelerating for a hill... nothing in tow.



2. A low pitch humming sound that you hear at highway speeds of 65mph or greater. It actually sounds like a truck with huge oversized tires on it passing you. It comes and goes but definitely is present more than it is absent. The sound can be amplified when you steer slightly left but will go away when you steer slightly right. FYI truck pulls to left as if misaligned but I just had an alignment with 4 new shoes the other day. Tire size 245/75/16 Is this a possible suspension part that is bad



Any ideas would be helpful. Thanks.

 

[johncameron]

# 2 sounds like a right wheel bearing to me.



#1..... ? no idea

 

[FourBarR]

I agree with John wheel brg. I had that problem twice on my 2wd. First time truck on had 5000k . Jack it up and spin the front wheels you can generally hear the rough bearing. Hope this helps.

 

[KFranco]

Thanks for your suggestions. I will try tonight.

 

[obert]

#1)))) Maybe a loose or slipped intake hose clamp?

 

[rbattelle]

1. A high pitch humming sound that you hear only while accelerating to cruising speeds and while accelerating for a hill... nothing in tow.

My guess would be rear differential problem - possibly pinion angle.



What was the right answer?



Ryan

 

[KFranco]

Fixed one noise... hub/bearing other noise is still going on... the high pitched noise while accelerating???? Have to take to mechanic to diagnose a diff. problem since I have no experience there.