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Unread 04-13-2013, 10:16 PM   #1
LKCJ
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Model 20 Axle issues.

Hey Guys,

I'm new here. I have been reading a lot of threads on here, but have not
seen one yet concerning a problem that I am having with the model 20 axle.
When letting out on the clutch and accelerating I can feel the rear axle moving.
I had a buddy of mine follow me down the street in hopes that he could see what may be happening. He tells me that it seems to be shifting to the right.

It does not have the original diff.
I have to slightly pull the steering wheel to the left to keep the Jeep straight. Any help would be appreciated, or point me to a thread that may help!

Thanks,

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Unread 04-13-2013, 10:40 PM   #2
Cutlass327
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Check your u-bolts, they may be loose. Either that, or worn out/missing spring bushings.
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1978 CJ5 258/T177/D300, '86 D30/D44 WT axles, 'glass tub windshield frame, and fenders, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy

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Unread 04-13-2013, 11:02 PM   #3
LKCJ
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Thanks Rick,

My name is Lance by the way! I have a new 4" rough country lift so spring bushings I hope would not be the issue. Ujoints and bolts have been replaced as well.
Tried posting a pic of the diff, but I don't have any of my photos in the proper format for uploading at the moment. I have been reading alot on here. So far the forum
is great, and it has given me alot of much needed info. Thanks for the response.

Lance
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Unread 04-13-2013, 11:42 PM   #4
LKCJ
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I hope that you guys can see this Pic. If not I will try again. I am woundering if the locker diff
may be causing this problem. Any thoughts?

Lance
img_0291.jpg  
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Unread 04-14-2013, 07:10 AM   #5
jp360cj
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Is the rear axle itself shifting to the right, or the whole Jeep?
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Unread 04-14-2013, 07:58 AM   #6
deadeye
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Try retorqueing your u-bolts, I bet they came loose.
The locker shouldn't make it pull if you are going in a straight line.
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Unread 04-14-2013, 09:02 AM   #7
LKCJ
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I think I need to back up and explain more. I will try to put these photos in proper order.
The PO had done a spring over lift and the Jeep was doing this when I bought it back.
I replaced the old original springs with a rough country lift. Still doing it. I have checked the ubolts
several times and torqued to rough country's spec each time. Still doing it. I am also trying to address
a steering issue. Put the sway bar back under the Jeep and a new steering stablizer and that helped the
steering some but with the rear axle moving around I don't want to go any further with the steering until
I get this addressed.

I feel the hole Jeep moving. Drove it again this morning. It feels more pronounced at the rear axle though.
img_0196.jpg   img_0253.jpg   img_0367.jpg  
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Unread 04-14-2013, 09:07 AM   #8
LKCJ
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Sorry guys for side way photos. Still trying to figure this out.
I hope it doesn't brake your neck!

Lance
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Unread 04-14-2013, 01:04 PM   #9
skizriz
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When you replaced the springs, did you flip the centering bolts to work with the SOA?

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Unread 04-14-2013, 02:32 PM   #10
LKCJ
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If i understand the question, no I did not. The reason that I didn't is because
I put the new springs back under the axle. I thought that by doing this it would
limit spring swaying and hopefully cure the rear axle movement. I had to cut the spring
perches off the top of the axle and weld them back on the bottom. The PO really did a poor
job SOA. Cut pretty deep into the axle when they removed them from the bottom side of the axle.
I had to fill those spots before welding the perches back on the bottom. Added some photos for the picture viewers
pleasure. Hope they help explain what has been done up to this point to try and correct the movement issue.

Lance
img_0232.jpg   img_0251.jpg   img_0263.jpg  
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Unread 04-14-2013, 03:18 PM   #11
skizriz
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That clears it up. I was going off of the picture that shows it as SOA.

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Unread 04-14-2013, 03:45 PM   #12
LKCJ
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I thought it might. I'm sorry for not explaining things better. My wife tells me that I have a hard time explaining myself. I tell her it's a guy thing. It's a good excuse when I'm asking to buy more parts. How's the weather in PA. Warming up here with lots of pollen.

I am trying to address all major mechanical issues with the jeep before I start the restore. Hopefully I can start taking this thing apart this fall. I plan to go back to as close to original as possible.

I found a 304 with carb and bunch of misc. parts, couple of aftermarket fenders, from this guy I know that did a restore on an 82. He only wants 2 hundred for all of it. The motor ran when he took it out. It has been stored in warehouse for three years. The crank turns. What do guys think about the price? Buy it or not?

Lance
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Unread 04-14-2013, 06:25 PM   #13
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No problem. I have problems typing out what I want to say. I type so slow, that I loose my train of thought as I go.
It's finally starting to warm up here. I took my winter top off finally. (bikini top,full soft doors, and a wind jammer....and Gore-Tex).

I wish I could think of a solution to your problem, but I'm stumped. The only thing I can think of is have somebody push the rear of the Jeep side to side, while you climb under there and see if anything is moving.
I hear that a rear locker can feel like it's pulling to the side as you get on and off of the gas, but I don't have any first hand experience with one.

Axle bearing shot....jack the rear up and grab a tire and try to push/pull it in and out??????
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Unread 04-14-2013, 08:19 PM   #14
LKCJ
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I understand. I'm stumped too! I have rebuilt the axle. New diff, bearings and seals.
I had trouble for a while with outer seals leaking. I finally put the axle in a machinel lathe,
cut them down and found that they where egg shaped. This was causing vibration in the rear end.
built the axle back up where the seal rides and cut it it .001 larger than the seal size. No more seal leaks
and no more vibrations. I have a video of it in the lathe somewhere and as it spins you can see where they
where egg shaped.

I will probably take the locker diff out and go back to the orginal spider gear assembly diff. Maybe this will fix the
problem.
img_0359.jpg   img_0361.jpg  
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Unread 04-15-2013, 12:15 AM   #15
streetpro
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Looks like you're using the OEM shackles. There's a lot of side slop in them, especially when they get egged out. That amount of wandering about combined with the locker kicking in could be a factor. Maybe some H style or other HD shackles would help.
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