Humming in Full time?

[HoosierJeeper]

Just noticed today 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?

 

[journeyjim]

How long since it's been in full time?, I notice that if I don't engage the four wheel every so often that the first time I do it seems to be a noise, mainly in part time, but I engage it a few times during the summer going down the drive just to move things.

 

[HoosierJeeper]

It gets engaged about once a month, at least for a day.

 

[journeyjim]

I would be checking the fluid level in the transfer case then, unless the fluid has broken down. You can use regular lube in the transfer case.

 

[TwoBobsKJ]

I would be checking the fluid level in the transfer case then, unless the fluid has broken down. You can use regular lube in the transfer case.

The T-Cases in the Libby take ONLY ATF+4 - no gear lube at all.

Bob

 

[HoosierJeeper]

I would be checking the fluid level in the transfer case then, unless the fluid has broken down. You can use regular lube in the transfer case.

I'll check it, but I've noticed no leaks, and the dealer did it just less than 10k ago... :Frustrated:

Thanks everyone!

 

[journeyjim]

Are you sure the hum is coming from the transfer case? cause I don't understand why it only does it in full time.

 

[HoosierJeeper]

I don't think it's coming from the transfer case. Not sure. But, I have this thread on LOST too, and JeepJeepster said that it's nothing to really worry about.

 

[ephantmon]

It's probably humming because it doesn't know the words :happy175: Sorry, couldn't resist.