post #1 of Old 08-20-2007, 05:15 PM Thread Starter
lupinsea
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Front Unit Bearing - Does it NEED the Driveshaft Bolted In?

Can you run on JUST a front unit bearing / hub without the TJ's front axleshafts if need be?

This weekend we discovered (on the trail) that a friend of mine had a busted front axleshaft (right at the unit bearing) AND a toasted unit bearing. There wasn't much we could do about the axle but pull it but figured we could replace the front unit bearing so that he could at least get home.

Afte a getting a new unit bearing from the parts store we installed it (without any driveshaft at all) and proceeded to drive our Jeeps into town. We got about 20 miles into town when the wheel fell off when starting up at an intersection. The new unit bearing had just completely separated and come apart. When the wheel went it ripped of the caliper and shattered the front steering knuckle caliper mounts. Fortunately my friend was only going about 2-3 mph when it happened but it raised the question:

Does the TJ's front unit bearing NEED the sub-shaft of the front axle shaft to be inserted into the bearing and the axle nut torqued down to keep the bearing from separating?


Any thoughts on why the repalcement unit bearing separated?


- Jay
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post #2 of Old 08-20-2007, 05:34 PM
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This thread talks about that on starting on the second page I think

http://www.jeepforum.com/forum/f9/can-i-drive-without-my-inner-front-axle-shaft-451806/

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My issue was I couldn't get the balls centered. I had to use some extra force to get everything lined up right. It didn't take me long.


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post #3 of Old 08-20-2007, 05:40 PM
Bigbob
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You have to have the stub in there or the bearing will come apart.

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post #4 of Old 08-20-2007, 06:18 PM
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dopn't ever ever run without the stub shaft in there. Some poor guy did that and died just recently.....
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post #5 of Old 08-20-2007, 07:04 PM
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Quote:
Originally Posted by lupinsea
Does the TJ's front unit bearing NEED the sub-shaft of the front axle shaft to be inserted into the bearing and the axle nut torqued down to keep the bearing from separating?


Any thoughts on why the repalcement unit bearing separated?
Yes, the stub axle needs to be installed. It separated because it wasn't. If you ever get in that situation again, you have to leave the stub installed, and you can pull the inner axle and stuff a rag in the housing to get you home.

-Roger
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post #6 of Old 08-21-2007, 10:27 AM
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I be the victim he's talking about. Lessoned learned.

http://www.links4jeeps.com/phpBB2/viewtopic.php?t=6279

Problem was there wasn't a shaft left for the backside of the bearing to hold against.

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post #7 of Old 08-21-2007, 01:31 PM
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The unit bearing is not held together by anything but the axle nut that bolts to the stub shaft. Think of it like two halves, the inner half bolts to the knuckle while the outer half bolts to the wheel. Without the stub shaft bolted in place with the axle nut, holding the two halves together, it WILL (there is no IF here) come apart.

I keep a 36mm socket, and spare front shafts in my TJ at all times.

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post #8 of Old 08-21-2007, 01:35 PM
PeteC
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Quote:
Originally Posted by lupinsea.......................................... ..................................................
Does the TJ's front unit bearing [I
NEED[/I] the sub-shaft of the front axle shaft to be inserted into the bearing and the axle nut torqued down to keep the bearing from separating?
.................................................. .............................................

Simple answer......YES

But only if you want to avoid the very thing that already happened.

The hub will fail without the outer shaft and nut installed.

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post #9 of Old 08-21-2007, 01:37 PM
rljsrubicon
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Not good

It's not a good thing; in fact very bad... Ron

Quote:
Originally Posted by lupinsea
Can you run on JUST a front unit bearing / hub without the TJ's front axleshafts if need be?

This weekend we discovered (on the trail) that a friend of mine had a busted front axleshaft (right at the unit bearing) AND a toasted unit bearing. There wasn't much we could do about the axle but pull it but figured we could replace the front unit bearing so that he could at least get home.

Afte a getting a new unit bearing from the parts store we installed it (without any driveshaft at all) and proceeded to drive our Jeeps into town. We got about 20 miles into town when the wheel fell off when starting up at an intersection. The new unit bearing had just completely separated and come apart. When the wheel went it ripped of the caliper and shattered the front steering knuckle caliper mounts. Fortunately my friend was only going about 2-3 mph when it happened but it raised the question:

Does the TJ's front unit bearing NEED the sub-shaft of the front axle shaft to be inserted into the bearing and the axle nut torqued down to keep the bearing from separating?


Any thoughts on why the repalcement unit bearing separated?
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