post #1 of Old 02-15-2010, 02:09 PM Thread Starter
hdfxrs91
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Question regarding front axle -- Fixed!

Hello all,
I replaced the front pads and rotors on my 87 the other day. Putting the wheels back on, I noticed that on the right (passenger) side, the axle portion (not the knuckle) of the assembly had a lot of play, whereas the driver's side does not. When I say play, I mean I can move the rotor assembly back and forth, and see the U-joint moving with it. My thoughts are that this is the "short axle" side and it's normal, but I wanted to be sure by asking the experts here. My experience is limited when it comes to 4-wheel drive drivetrains.

Thanks

Edit: I shouldn't say "back and forth". I should have said "up and down" and "left and right".


Last edited by hdfxrs91; 02-28-2010 at 09:20 PM. Reason: Semantics
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post #2 of Old 02-15-2010, 02:42 PM
Mean Max
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Sounds like a bad unit (wheel) bearing to me.

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No one here knows what they are talking about. You should try Pirate 4x4 they will be happy to help you.

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post #3 of Old 02-15-2010, 02:56 PM
rustywrangler
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Unit bearing is shot


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post #4 of Old 02-15-2010, 02:58 PM
Rocky_Cosmark
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Yea, that is the short side actually, but it sounds like a bearings bad like he said, does your wheel ever shake alittle while driving?
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post #5 of Old 02-15-2010, 03:18 PM Thread Starter
hdfxrs91
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No shaking, but now that I think about, I did hear a knock on that side now and then. Thanks for all the replies.
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post #6 of Old 02-15-2010, 03:30 PM
Gobi_Gred
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Not a diffucult repair. There are 3 12-point bolts on the back side of the knuckle. Then there is a BIG nut that holds the axle onto it.

Most likely it is all rusted together. What I have done is take the axle out with the bearing and work on it on the bench.

If you can find a good one at the junkyard(impossible around here) you can just slide the whole new one in and only deal with those 3 bolts
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post #7 of Old 02-15-2010, 08:41 PM Thread Starter
hdfxrs91
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I know I'm being lazy by not going to the garage to get the Haynes manual, but are the bearings pressed in like a front-wheel drive unit or are they tapered bearings like a normal hub?
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post #8 of Old 02-15-2010, 08:46 PM
burnout189
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they are a unit bearing meaning that you unbolt the whole assy with 3 bolts, toss it, and bolt on the eniter new hub, wheel studs and all.

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post #9 of Old 02-15-2010, 09:24 PM Thread Starter
hdfxrs91
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Oh, I see. Thanks. I thought it might have been a repairable item. Silly me, what was I thinking? It is a Jeep after all.

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post #10 of Old 02-15-2010, 09:52 PM
sequel
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When you go to remove the unit bearing from the knuckle, usually they are stuck on there pretty good. Here is the easy and cheap way to get them off:

http://www.stu-offroad.com/axle/unit...tbearing-1.htm

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post #11 of Old 02-25-2010, 09:03 AM Thread Starter
hdfxrs91
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So I bought a new unit bearing (Advance Auto, $70), and nearly split a kidney trying to get that nut off. Haynes manual says 175 ft-lbs. Luckily I have friend that works at a garage, and he'll get that off for me. What do you guys do to get it back on, though? Put the wheel on the ground and torque it from there? Or jam prybar in the studs and let it hit against the ground?
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post #12 of Old 02-25-2010, 11:07 AM
disarm6565
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I put a wrench inbetween the knuckle and the axle shaft and crank it back on with a breaker bar.

1993 4.0 AX-15
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post #13 of Old 02-28-2010, 09:23 PM Thread Starter
hdfxrs91
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Got it done today. Really is not that bad of a job. Of course the unit refused to budge, but a gear puller and a few light taps with a 3lb sledge work wonders. It seemed to be stuck more on the knuckle than on the splined shaft. Well, onto the next job... replacing the slave cylinder.
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post #14 of Old 03-29-2010, 04:44 PM
John92YJ
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I have a bearing going out so I was just going to replace the bearing but you guys are saying I haft to replace the hole hub is that right?
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post #15 of Old 03-29-2010, 04:53 PM
sequel
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Quote:
Originally Posted by John92YJ View Post
I have a bearing going out so I was just going to replace the bearing but you guys are saying I haft to replace the hole hub is that right?

The front is a unit bearing...aka it has the hub and a sealed bearing all as one unit. Pretty common in today's cars.

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