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Modified JK Tech Tech related bulletin board forum regarding subjects such as suspension, tires & wheels, steering, bumpers, skid plates, drive train, cages, on-board air and other useful modifications that will help improve the performance and protection of your Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) on the trail.

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t case blew up

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Old May 16, 2012 | 02:45 PM
  #21  
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Originally Posted by damon.l
punctuation and proper english. they make your post more readable.
I didn't know this was an English class. I had no problems reading and understanding.
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Old May 16, 2012 | 02:55 PM
  #22  
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Originally Posted by Dynatrac
While you have the rig on flat ground and no front drive shaft attached to the front axle, put an angle finder on the front axle pinion flange. Please get that angle and I can tell you your caster. Bad caster angles are usually a major factor in these failures.
I would think trying to maintain good caster would increase the angle between the pinion and drive shaft.
Conversely, trying to maintain a good pinion/drive angle, would cause a bad caster angle.
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Old May 16, 2012 | 03:09 PM
  #23  
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Originally Posted by ronjenx
I would think trying to maintain good caster would increase the angle between the pinion and drive shaft.
Conversely, trying to maintain a good pinion/drive angle, would cause a bad caster angle.
Very true Ron. My comment was more generic- bad caster angles on JK housings are the cause of many failures. While trying to maintain decent steering manners, these poor angles lead to improper DS angles.
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Old May 16, 2012 | 03:14 PM
  #24  
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Originally Posted by Dynatrac
Very true Ron. My comment was more generic- bad caster angles on JK housings are the cause of many failures. While trying to maintain decent steering manners, these poor angles lead to improper DS angles.
Yes, I see. We've had this conversation before about the need to rotate the center housing in relation to the C's.
I didn't make that connection from your post.
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Old May 16, 2012 | 03:26 PM
  #25  
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Originally Posted by greenmonster516
like it still spins.. its just not pulling the jeep... right?
Thats why you can't tow a JK with a front wheel car dolly. Lub problems me thinks

33

Last edited by 33 williys 77; May 16, 2012 at 03:50 PM.
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Old May 16, 2012 | 03:32 PM
  #26  
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Originally Posted by Dynatrac
Very true Ron. My comment was more generic- bad caster angles on JK housings are the cause of many failures. While trying to maintain decent steering manners, these poor angles lead to improper DS angles.
Back in the old day's it use to be 3 deg now they say 6 deg, make me think of a driveshaft catch loop off the punkin, even stock this make's me scared. Don't need to be flipping on the interstate.

33
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Old May 16, 2012 | 03:39 PM
  #27  
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Originally Posted by ronjenx
That is pretty much the recipe for disaster.

How was your front pinion aligned with the drive shaft?
A double cardan at the t-case requires the single at the front to have no more than a very few degrees of misalignment between drive shaft and pinion.

Another factor is maintenance. How often have the u-joints been greased.
Had my JK 3 years now still stock with an AEV 2.5" lift going on this year.
So where exactly do I grease the U Joints & will that be able to be done on both front & rear plus what will I require to do this ?
Also what about the rubber boots. Do they require some maintanence ?
What should be the OK angles for alignment.

Still learning all this stuff as you can tell.

Oh buy the way Ron I'm off to Duxford again this year for 'Flying Legends'
What did you want me to look for in that Concord again ?
Didn't get a chance last time. Too many Spitfires & Mustangs to watch

Thanks
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Old May 16, 2012 | 03:42 PM
  #28  
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Originally Posted by Dynatrac
Very true Ron. My comment was more generic- bad caster angles on JK housings are the cause of many failures. While trying to maintain decent steering manners, these poor angles lead to improper DS angles.
What angles should a JK strive for?
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Old May 16, 2012 | 03:56 PM
  #29  
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Originally Posted by teh215
What angles should a JK strive for?
Did you see this article? Project-JK.com - Jeep JK Wrangler Resource » Jeep JK & Caster: What is it? How do I measure it and how does it affect my Jeep?

JK caster isn't great from the factory at just over 4*. When a JK is lifted, even just a little, the DS angle can be adversely affected. With a 4" lift, the DS angle must be corrected. To correct the DS angle you're taking away caster. 2* of cater is marginal but it's pretty common when you see a corrected DS angle.
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Old May 16, 2012 | 04:05 PM
  #30  
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Originally Posted by RLT
Had my JK 3 years now still stock with an AEV 2.5" lift going on this year.
So where exactly do I grease the U Joints & will that be able to be done on both front & rear plus what will I require to do this ?
Also what about the rubber boots. Do they require some maintanence ?
What should be the OK angles for alignment.

Still learning all this stuff as you can tell.

Oh buy the way Ron I'm off to Duxford again this year for 'Flying Legends'
What did you want me to look for in that Concord again ?
Didn't get a chance last time. Too many Spitfires & Mustangs to watch

Thanks
The "lubing the u-joints" I spoke of refers to aftermarket drive shafts. They have grease fittings on them.
The stock cv joints would have to be disassembled to properly lube them.

I envy you the Duxford trip. I really enjoy that stuff.
Look for a MAINEiac sticker on the side of the Concord. It was put there back in the '80s when it came through Bangor, Maine.
(I'll post a pic of a sticker as soon as I find one on my computer.)
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