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SPARTAN LOCKERS are on sale BIG TIME at ROCKRIDGE 4WD!Ruffstuff XJ Unirail Channel Reinforcement....Shop Stuff to Complete the Job!

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Unread 07-05-2014, 12:17 PM   #1
Layth
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2012 JK Wrangler 
 
Join Date: Nov 2005
Location: South Dakota
Posts: 132
4WD and Hubs

Hey all,

I'm more than a little embarrassed I have to ask the forum this after having 2 JK's since 2007. But ask I will.

I am diagnosing what I *think* is a bad unit bearing on my 2012 with only about 20,000 miles on it. The symptom is a really bad squeal / squeak that changes speed as the wheel speed changes. It's either the bearing or the front brake dragging. But I am pretty sure it isn't the brake.

Anyhoo, today I jacked up the front so I could spin both front tires. The sound is definitely coming from the passenger front wheel. But I did find that both front wheels were pretty hard to spin. You can spin them, but they won't free-wheel at all. They stop as soon as you let go. Then I noticed that the front drive shaft was spinning when I turned either front wheel.

So my question is, do these not have a normal locking-style hub? Or do they disengage in the transfer case? I guess I'm use to Fords where the hub disengages when you put it in 2H. So I just want to ask you guys if it's normal for the driveshaft to spin with the vehicle in 2H when you spin the front tires.

Thanks in advance. Now I shall go listen to my dealer blame my JCR bumper for a bad unit bearing. haha.

Layth

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Unread 07-05-2014, 12:35 PM   #2
jwmbishop
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2011 JK Wrangler 
 
Join Date: May 2011
Location: corsicana, tx
Posts: 3,290
These are continuous - they are always connected to the DriveShaft.
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Unread 07-05-2014, 01:45 PM   #3
222Doc
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2012 JK Wrangler 
 
Join Date: Sep 2011
Location: Lake Havasu City, AZ
Posts: 4,707
when the tire was off the ground did you grab it at 6 and 12 or3 and 9 and see if it has movement? should be rather tight. if it has slop then the Unite is bad. You run big tires, lots of offset? That can wear on them bad. Though most people kill the ball joints first. Them unit bearings are rather expensive on a JK. I can see them calling out the tires though as it is directly related to that bearing or ball joints tie rods ect. you never know though. depends on the dealer.
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Unread 07-05-2014, 02:37 PM   #4
Layth
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2012 JK Wrangler 
 
Join Date: Nov 2005
Location: South Dakota
Posts: 132
Thanks guys.

Doc, I run AEV's. They're at about 4.7" of offset. Been on for about 2000 miles is all. But I will get it back off the ground and look at it some more.

Thanks again for the feedback on the 4Wd drive and the bearings.

Layth
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