Just noticed yesterday when I had it in 4 full time, there was a buzzing/humming sound when accelerating, mainly between 30 and 40 MPH. No noise in 2WD. Fluids in transfer case and diff are pretty fresh (less than 10k on both, done at dealer) No noise when coasting either.
Any thoughts? Or is this normal?

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05 KJ Limited 4x4 in Light Khaki: Detours USA Backbone, Warn M8000, Huskyliners, RockLizard Super Skink sliders, OME/Bilstein Lift, JBA UCA's, 245/70/17 Nitto Terra Grapplers
07 LR3 SE V8
1996 XJ Country
2015 KL Limited

The two jeeps we have with select-trac do this. I always figured it was the front gears humming since they now have torque on them. Our xj is much more pronounced than my kj..

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LOST KJ'S
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Current Jeep: 2004 Jeep Liberty
-Atlantic Blue
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I guess. I'm trying to remember if my WJ did it. It doesn't bother me, as long as its harmless. Thanks

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05 KJ Limited 4x4 in Light Khaki: Detours USA Backbone, Warn M8000, Huskyliners, RockLizard Super Skink sliders, OME/Bilstein Lift, JBA UCA's, 245/70/17 Nitto Terra Grapplers
07 LR3 SE V8
1996 XJ Country
2015 KL Limited

My XJ has the select trac and it does it too. Kind of a humming or whirring sound.

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Dalton Caudell
Jeep Liberty: Sold... Build Thread: http://www.jeepkj.com/forum/showthread.php?t=45924
Red Jeep XJ: Build thread: http://www.cherokeeforum.com/f46/project-bigfoot-69539/ OR viewtopic.php?f=68&t=57768

My Liberty does the same, it's the part-time transfer case (NV231 i think? can't recall off the top of my head.)

Anyways, my Ford Ranger did the same thing. I just figured as noted above, you get that rumble since there's torque applied to the front driveline. I wouldn't worry about it unless you're getting an occasional popping, or feel some binding going on.

Exactly...


Other than that, it drives great! No harm no foul!

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05 KJ Limited 4x4 in Light Khaki: Detours USA Backbone, Warn M8000, Huskyliners, RockLizard Super Skink sliders, OME/Bilstein Lift, JBA UCA's, 245/70/17 Nitto Terra Grapplers
07 LR3 SE V8
1996 XJ Country
2015 KL Limited

Same here, and I believe it may also be caused by the repartition of torque at both ends, putting an added strain on the transfer case/transmission combo as well... No real adverse effect, mostly annoying, and can be somehow remediate with switching off of the OD, especially with my TCM tune locking from 3rd to 5th... Keeping the RPM higher alleviates the issue, in my experience.

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RIP 10/31/2012
Green Metallic 2006 CRD Limited
GDE Hot tune ~ Pre-F37 TCM ~ Transgo shift kit ~ MagnaFlow ~ Homemade Provent ~ OME 2" lift & Airlift ~ Samco ~ Euro TC ~ Lift pump ~ Nylon fan blade & Hayden clutch ~ Etc!