Correcting Rear End Angle - Page 2 - JeepForum.com
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post #16 of 34 Old 05-21-2013, 01:31 PM Thread Starter
DirtyDog
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Well, I guess I spoke too soon about the T-Case Drop working like a charm.

I have been having some vibrations the past few days, especially when decelerating.

When I finally got under the Jeep to check, my U Joint nearest the rear axle is completely shot.

Obviously, the bad U Joint is causing my vibration problem. I guess the change in the drive line angle was too much for my U-Joint to handle.

I have ordered two new U-Joints and some Warrior 6 degree steel shims to put under my leaf springs in the hope this will correct my angle problem.

Has anyone out there done a 4" pro comp lift on a YJ before and been able to correct their vibration problems with just a T-Case drop and some shims, or am I destined to have to spend another $600 for the SYE?

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post #17 of 34 Old 05-21-2013, 02:07 PM
Ken3783
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Quote:
Originally Posted by DirtyDog View Post
Well, I guess I spoke too soon about the T-Case Drop working like a charm.

I have been having some vibrations the past few days, especially when decelerating.

When I finally got under the Jeep to check, my U Joint nearest the rear axle is completely shot.

Obviously, the bad U Joint is causing my vibration problem. I guess the change in the drive line angle was too much for my U-Joint to handle.

I have ordered two new U-Joints and some Warrior 6 degree steel shims to put under my leaf springs in the hope this will correct my angle problem.

Has anyone out there done a 4" pro comp lift on a YJ before and been able to correct their vibration problems with just a T-Case drop and some shims, or am I destined to have to spend another $600 for the SYE?
My YJ had a 4" Superlift when I got it with a tcase drop and leaf spring shims without the SYE installed with no vibe issues. I don't have that lift anymore but it worked just fine without the SYE for me.

'95 Wrangler YJ: http://www.jeepforum.com/forum/f22/m...rship-1481851/
'98 Cherokee XJ: http://www.jeepforum.com/forum/f22/k...41/index2.html
'07 Grand Cherokee WK ("No Mods"-The Wife)
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post #18 of 34 Old 05-21-2013, 02:10 PM
Siva283
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6 degree's is to much without an sye. Replace your u joint and drive it a bit. When you drove it without hte Tcase drop it probably took its toll on it and came out after the tcase drop.

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Quote:
Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Quote:
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
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Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #19 of 34 Old 05-21-2013, 02:11 PM
Siva283
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Read and reread the info at this link until it makes sense. It will explain all of this to you very well and give you a great understanding of what is going on.

http://www.4xshaft.com/driveline101.asp

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Quote:
Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Quote:
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
Quote:
Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #20 of 34 Old 05-21-2013, 03:49 PM
Cashcrazy
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I had a CJ7 with 4" leaf spring lift, 2" shackle lift, and a 1" body lift. The angle was a real problem for me so I did a 1" tcase drop. Instead of shims I removed the spring perches and re welded new ones with the pinion turned up. I can't remember the degree of angle I used on the pinion but it was supposed to be the max before having problems. I had zero vibration problems. I think the shackle lift created a bump steer death trap problem so I shimmed the front axle. I could not turn the pinion on it because the front axle was from a Scout D44 and the spring sat on the edge of the pumpkin which had been professionally milled and I didnt want to mess it up. I have been told shimming the front is a no-no, but it did help the death steer.
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post #21 of 34 Old 05-21-2013, 04:50 PM Thread Starter
DirtyDog
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I have taken some pictures of my drive line and uploaded them to imageshack.

Would you guys take a look and tell me what you think about my angles?

Again, the U-Joint that went bad is the one closest to the rear axle, not the one near the transfer case. If you look closely, the top snapped off.

These are taken from the passenger side of the Jeep.

http://imageshack.com/my/images

The shims that I ordered are 6 degree shims from Warrior, but I don't want to put them in and mess something else up if all I need is new u joints.
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post #22 of 34 Old 05-22-2013, 06:25 AM Thread Starter
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post #23 of 34 Old 05-22-2013, 06:48 AM
Ken3783
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Based on those photos the axle could be positioned better through a 2 or 4, depending, but a 6 seems too much. I had a 6 on my 6" lift before my 8.8 swap and a 6 would be too much, in my opinion, for a 4". If the vibes only started a few days ago after working for awhile, I would just fix the broken parts and ride that. If the vibes are still there then worry shimming the axle at that point.

'95 Wrangler YJ: http://www.jeepforum.com/forum/f22/m...rship-1481851/
'98 Cherokee XJ: http://www.jeepforum.com/forum/f22/k...41/index2.html
'07 Grand Cherokee WK ("No Mods"-The Wife)
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post #24 of 34 Old 05-22-2013, 06:58 AM
fbv193
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I believe that with the rear axle dropped 4 inches lower, you will need an angled shim to bring the pinion up a bit even with a TC drop. I dont know if 6 degrees is correct though, it may be. You did right by ordering steel shims, the aluminum ones crack and break apart, then get spit out. My first lift came with aluminum shims, they did not last. When I put my current lift on (3.5 inch) I made some steel shims, they are still intact after lots of hard use.
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post #25 of 34 Old 05-22-2013, 08:18 AM Thread Starter
DirtyDog
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Thanks for the input thus far.

I would hold off on the shims, but I don't want to risk messing up U joints again.

I imagine I will need longer centering pins as a result of having to install shims. Anyone know what length pins I will need?

I am thinking of getting some 4 degree shims as a middle of the road option between the 2 degree and 6 degree.
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post #26 of 34 Old 05-22-2013, 08:45 AM
ki4cye
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I started a thread recently in the drivetrain section titled need driveline help. I have a 4" procomp lift and had to remove my shims to get everything right. There are before and after pics. My solution might not apply for your problem because I'm running a Chevy 350. You can also check out the billavista tech pages on pirate 4x4. There is some good info there. Sorry I don't know how to post links from the IPod with the jeepforum app

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post #27 of 34 Old 05-22-2013, 08:49 AM
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Before
image-2123824975.jpg



image-704519210.jpg



image-2225682478.jpg




After
image-1383911158.jpg



image-982403459.jpg





image-896231524.jpg



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post #28 of 34 Old 05-22-2013, 09:28 PM Thread Starter
DirtyDog
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Based on your pics ki4cye, it would look like my rear axle needs to come up just a tad. I would say mine is pointed just a tad downward compared to yours.
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post #29 of 34 Old 05-23-2013, 02:47 AM
ki4cye
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The way i understood it if your not running a double cardin the pinion shaft and the transfer case shaft should be at the same angle. The transfer case will be higher than the pinion. As long as the drive shaft angle doesnt excede the limits of the u joint throught its travel it will be ok. Someone please correct me if im wrong.

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post #30 of 34 Old 05-23-2013, 03:52 AM
Siva283
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Quote:
Originally Posted by ki4cye View Post
The way i understood it if your not running a double cardin the pinion shaft and the transfer case shaft should be at the same angle. The transfer case will be higher than the pinion. As long as the drive shaft angle doesnt excede the limits of the u joint throught its travel it will be ok. Someone please correct me if im wrong.

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This is correct. If he read the link I posted he would know this

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1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Quote:
Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Quote:
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
Quote:
Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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