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Old 12-09-2013, 06:59 PM   #1
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TJ axle shaft conversion

I had a leaky axle seal on my D30 on the passenger side. So since I had to tear it apart anyways I went to the bone yard and picked up a solid axle shaft from a 97 TJ and proceeded to get greasy...
The leaky culprit!

The TJ axle

All open.

Where the new seal part # 11800 or the Orielly's cross over part # (that I picked up for $10.99) 471765

Here's the new seal on the 34mm axle nut socket that fit perfectly on the seal to tap it in.

Here's the new axle shaft passing thru the CAD location. Just for the fun of it, I left the original axle seal in place since the half shaft was thicker in diameter than the TJ shaft.

The block off plate I built out of 16ga galvanized steel and painted black.

Here's the pile of parts that are no longer needed after the axle swap. I also removed all the vac lines to the CAD and just unplugged the 4X4 dash light controller.


Key note for anyone wanting to do this. YOU MUST CHANGE THE HUB ASSEMBLY ON THE TJ AXLE SHAFT TO THE ORIGINAL YJ HUB ASSEMBLY!!!! The TJ hub allows the wheel to sit 3/8" too far back on the hub and will pressure lock the wheel against the heat shield. I added some washers behind the brake disk for now until I have a chance to change the hubs out. It kinda works but there is a slight wabble to the wheel at about 45 mph.

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Old 12-09-2013, 07:12 PM   #2
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Nice.

I swapped out two unit bearings from one set of axles to another set of axles today while working on a TJ.

If you take a prybar & position it between the axle shaft ears to lock them down (since the axle shafts are removed) and take a good impact gun or breaker bar, and a 36MM socket, you can break loose the hub nuts and migrate the unit bearings.

IIRC, some are torqued to ~250 ft lbs.

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Old 12-09-2013, 07:43 PM   #3
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Cool, thanks Joe. I am planning on getting to that this week and I'll do that.
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Old 12-09-2013, 07:55 PM   #4
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Good write up and great pics! Now doesn't your driveshaft always spin?
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Old 12-09-2013, 08:03 PM   #5
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Yes it will. With a balanced front shaft no problem. Some say they lose 1 mpg. I haven't noticed any loss no vibes.
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Old 12-09-2013, 08:11 PM   #6
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Cool. Just checking.
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Old 12-09-2013, 09:05 PM   #7
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I can't imagine a detectable loss in mpg's by swapping to a 1 piece inner passenger side axle shaft.

Inversely, same doubt goes for swapping to manual hubs.
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Old 12-09-2013, 09:22 PM   #8
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Someone posted his mpgs and how different mods affected his and it was 1 mpg most everyone else that responded to the thread said no changes.

I don't even notice it other than that posi lock is no longer in front of knee.
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Old 12-09-2013, 10:07 PM   #9
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I have a solid axle as well. Beats the hell out of a posi locker and costs less. Not sure what problem you had with the hub though. I swapped my hub onto the XJ shaft I used and that was that.
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Old 12-10-2013, 07:36 AM   #10
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Silly question maybe, but what's the benefit here?
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Old 12-10-2013, 09:33 AM   #11
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Quote:
Originally Posted by Razzer View Post
Silly question maybe, but what's the benefit here?
No CAD to fail. If your transfer case works, then you will always have 4X4. Strength is negligible, but if you get a newer shaft you will get larger UJoints as well. Also, you can use greasable axle tube seals which are not available for a split shaft. That will prevent the seals from going out for quite a while. The seal at the CAD is a common failure. With a solid shaft it gets moved to the Diff housing.
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Old 12-10-2013, 11:16 PM   #12
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The problem I had was a wabble that felt like a balance issue coming from the right front. It didn't start until I did the conversion and I had to space out the disk from the hub with some washers to get my wheel to clear the heat shield. I'll get it swapped over to the YJ hub this week and see if it goes away.
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Old 12-11-2013, 05:58 AM   #13
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I sourced a98 XJ shaft. The part numbers for a 93 yj hub and 98 XJ hub are the same. Maybe you just got a bad hub.
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Old 12-11-2013, 07:29 AM   #14
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when i replaced my front u joints it caused a vibration in my front shaft around 18-25 MPH when in 4x4. I am wondering if this is just going to be an annoyance, or if it will cause other problems
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Old 12-11-2013, 09:49 AM   #15
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Vibration can cause other problems like premature u joint wear. Fishnic do u have solid shaft? If so it shouldn't matter of your in 2 or 4 wheel. The shafts spin regardless. The 4wd only engages the tcase. Possibly a tcase problem.
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Old 12-11-2013, 09:50 AM   #16
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Quote:
Originally Posted by Fishnic View Post
when i replaced my front u joints it caused a vibration in my front shaft around 18-25 MPH when in 4x4. I am wondering if this is just going to be an annoyance, or if it will cause other problems
Vibes cause other problems over time. They cause bearings and seals to fail prematurely. Will also cause you to go through u joints a lot faster. Sounds like you either have to get your front driveshaft balanced, or a needle bearing feel on its side in the cap of the ujoint when you replaced it.
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Old 12-11-2013, 09:56 AM   #17
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Originally Posted by OverkillYJ View Post
Vibes cause other problems over time. They cause bearings and seals to fail prematurely. Will also cause you to go through u joints a lot faster. Sounds like you either have to get your front driveshaft balanced, or a needle bearing feel on its side in the cap of the ujoint when you replaced it.
i think i need to rotate the shaft 180 degrees and reinstall. i didnt have the shaft marked and didnt get it installed in the same original position with the yoke. i didnt mark it since everything i read was that the shaft wasnt balanced from factory - so i didnt think it mattered.
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Old 12-11-2013, 10:04 AM   #18
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Can def try that and see what happens
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Old 12-11-2013, 11:01 AM   #19
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With the stock axle the shaft doesn't spin so it doesn't matter. With a solid axle it turns though which means you have other things to address.
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Old 12-11-2013, 09:10 PM   #20
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I sourced a98 XJ shaft. The part numbers for a 93 yj hub and 98 XJ hub are the same. Maybe you just got a bad hub.
93 and 98, yes, but I have a 90. I got the hub changed out this afternoon, so now it's a moot point. All is well again. 8)
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Old 12-11-2013, 09:42 PM   #21
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im pretty new to owning a jeep so correct me if im wrong but what im reading here is that you guys switched the passenger side axle to a straight one off a newer jeep tj or xj? is this an expensive conversion and you can use a hub and axle assembly off a tj or xj?

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