Whistle/whining noise while accelerating in 4wd

[Kaden]

Hi I was driving the other day in my Jeep and I put it into 4wd due to snow and ice on the backroads were I live and noticed a whistle or whine when I accelerated but stopped after I took my foot off the accelerator. Does anybody have any idea as to what this might be caused by?

 

[ltd02]

Have you checked the ends of the front driveshaft for cracked or torn boots? How's the tcase and diff fluid? Serviced lately?

 

[Kaden]

The boots were replaced before I got it and as far as the diffs and tcase fluid goes I have no idea. Will defiantly be doing it this spring though. Could just be the below zero weather we’ve been having because after I drive it for awile the noise goes away. No reason to tear into it know I guess unless it gets worse.

 

[Aceofspades]

I can hear a difference in the driveline noise when accelerating or maintaining throttle when in 4wd. Just thought it was normal...

 

[Kaden]

Maybe it is I don’t really know. This is the first winter for me with my kJ. It has never made any noises when it was warmer outside which is why I made a post about it. All the other threads I’ve read online said it could be anything from the oil in the tcase being so cold to the diffs, ******, and tcase being junk. Like I said ill just wait and see what happens if anything.

 

[HoosierJeeper]

Check the front driveshaft for slop. Should be able to rotate it a little but not a lot. I'm guessing the tcase end CV is shot. Mine made all sorts of noises - went from a quiet hum in 4wd that I thought was normal and lived with it for years then to sounding like I was dragging chains.

Mine feels/acts differently in 4WD too. Obviously the traction, but it sounds different...not louder or weird, there's just a different sound to it.

 

[Aceofspades]

^ ya same here an everything is new for the most part

 

[Kaden]

allright thanks I’ll check that out

 

[Kaden]

It’s not really a hum it’s more like a turbo whistle.

 

[HoosierJeeper]

Are you sure it's only when you're in 4WD? I had a belt tensioner that whistled when it was single digits out.

 

[Kaden]

Positive only in 4wd then after awile of driving you can’t hear it

 

[HoosierJeeper]

Check the driveshaft.