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Unread 01-23-2013, 11:43 AM   #1
kjg26
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drive line angles

After swapping in the OME springs I went for my first test drive. Immediately I got vibes. I'm running 36R springs on all corners with 5/8 lift boom shackles. The rear axle has the OME shims that come attached to the leaves.

Here is what I'm working with


forumrunner_20130123_124247.jpg



forumrunner_20130123_124254.jpg



forumrunner_20130123_124303.jpg

How does that angle kook?

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Unread 01-23-2013, 12:06 PM   #2
kahanabob
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Great you posted pic's......
your TC looks to high, suggest a 1" drop kit.
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Unread 01-23-2013, 12:08 PM   #3
kjg26
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Would a mml work in the same fashion? Ill eventually go with sye and dc drive shaft but I'm trying get her on the road asap.
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Unread 01-23-2013, 12:09 PM   #4
olsont
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or shim the axle more. Sorry no measurements I sold my jeep but thats the problem I had
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Unread 01-23-2013, 12:36 PM   #5
kjg26
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Just spoke with arb, manufacturer of ome, they said it came with "about 3 degree shims". I wouldn't think id want to go too much more....hell I dunno. How do I measure the angles at the tc and the axle.
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Unread 01-23-2013, 12:49 PM   #6
bogleparsons
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Cheap angle finder with magnetic base.

Yes a 1" mml would help this.

I have a 10deg shim under my axle and it works fine. Also remember it may settle slightly.
angle_finder.jpg  
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Unread 01-23-2013, 12:51 PM   #7
jbolty
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Axle shims are the wrong way to go. The geometry of a stock type drive shaft does not have the pinion pointing at the Tcase yoke. You need a transfer case drop as a short term fix, then an SYE as soon as you can get to it. Perhaps a MML as well.

Here's the differences
tomwoods1.gif   tomwoods2.gif  
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Unread 01-23-2013, 01:02 PM   #8
kjg26
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What size trans drop should i order? Is there any definitive way to measure exactly which I need.
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Unread 01-23-2013, 01:08 PM   #9
mrdeath2000
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Think ahead on what you plan to do for the future. Are you going to put an autolocker in the front or TJ shafts? Anything that will cause that front DS to spin all the time? If you do, a MML lift helps the back but points the front output up and may create vibes there if you do a front auto locker.

TC drop is probably best until you can do an SYE. You could also try and remove the axle shims to lower your diff down to be more paralell, but it may also be close to binding.

Get an angle finder like above for sure, maybe even a digital one with a hold button. This is where you really need to do some planning.
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Unread 01-23-2013, 01:18 PM   #10
jbolty
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^^^ this.

Plan a little. If you go with a SYE you will need to cut an re-weld your sprint perches. If you are going to go thru all that you might as well do an 8.8 swap and get the proper length drive shaft all at the same time.

It never ends.

As far as I know tcase drops only come in one size; they are all about 1 1/2
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Unread 01-23-2013, 01:35 PM   #11
kjg26
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I found some 1" and 2" drops. I think 1.5 as well. I'm heading to the store to pick up an angle finder. Where do I need to measure? Can't find a dummies guide for measuring
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Unread 01-23-2013, 03:28 PM   #12
kjg26
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Ok I got an angle finder

At the rear pinion

forumrunner_20130123_162705.jpg



forumrunner_20130123_162712.jpg

At the tc slip yoke/u joint


forumrunner_20130123_162751.jpg



forumrunner_20130123_162758.jpg


Drive shaft angle



forumrunner_20130123_162824.jpg



forumrunner_20130123_162831.jpg

Am I measuring right? Thoughts on the angles?
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Unread 01-23-2013, 03:38 PM   #13
mrdeath2000
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If I'm reading those right, your Pinion Angle is +2 (that's not great).

Diff is pointed up 8*
TC is pointed down 6*

You want the diff to either point up at 6* instead of 8* (probably remove shims) or the TC to point down 8* instead of 6* (TC drop). That would give you a PA of 0*, you usually want about negative 0.5 - 1.5* to allow for wrap up during accel. You dont want too much negative because its not a drag car and you dont want mad vibes on decel with it wraps down.

Keep in mind when measuring the differential, it is sometimes hard to get a flat surface on that yoke, I like to use a socket on the u-joint to make a flat spot and compare it to the angled flange of the housing itself.
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Unread 01-23-2013, 03:45 PM   #14
0verkillYJ
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I would lengthen that driveshaft before ordering a drop. Longer shaft means reduced angle. It should be riding on the slip yoke where it rode before you lifted it. Put your money into keeping it lifted. Dont lift the suspension just to lower the center. Do it right.
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Unread 01-23-2013, 03:55 PM   #15
kjg26
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A sye and shaft are in the future, just not the immediate future. So my options as of right now are, 3/4 inch tc drop, 1.5 inch tc drop or removed shims.

Thoughts.
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