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Old 07-12-2007, 06:44 PM   #1
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Question Front axle shims

OK, I'm getting conflicting feedback on this. I recently purchased a Black Diamond 1.5" lift kit. The front springs came with shims installed and the thick end towards the front, shackle end. Installed this way it would point the pinion angle towards the ground.
This doesn't make sense to me, isn't the point to raise the pinion side (rear) of the axle up to reduce the angle of the driveshaft? If so than the thick end should be towards the rear of the spring (main eye side). Remember this is for the front axle. FYI, the rear springs didn't come with any shims. If someone can help me understand this I would appreciate it. Thanks in advance for your help.

Al

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Old 07-12-2007, 07:30 PM   #2
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Maybe a visual will help


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Old 07-12-2007, 07:41 PM   #3
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Ohhh! I get it!!!!!!! I hope you didn't go thru all that trouble just for me. Thanks a ton, I just didn't want to install it all wrong and have to take it all apart again. I owe you a beer!

Al
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Old 07-12-2007, 07:44 PM   #4
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I accept Miller


n/p took me all of 30sec to make
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Old 07-12-2007, 10:12 PM   #5
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that kind of odd on my re kit it came with shims for the rear and none for the front ??????? and the shim are over the springs not under them so the fat end would face the transfer case .......i think ...uuuhhhh....mabey
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Old 07-12-2007, 10:14 PM   #6
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rear is more important because of the super short drive shafts that Wranglers have in the rear... need that pinion angle to be good for no vibes
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Old 07-15-2007, 11:57 AM   #7
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Quote:
Originally Posted by AzTJ View Post
Maybe a visual will help

I've read this post a dozen times to make sure that I wasn't about to put my foot in my mouth, so here goes. The picture shows the shims below the spring. This would be correct if YJ axles were also below the spring or if it had a SOA conversion. However, ursandal is speaking of a standard 1.5" kit, I'm assuming, and therefore the shims should be on top of the springs. If the thick end of the shim is above and forward on the front spring it would, in fact, angle the pinion down. I don't know why you would want it angled down. I'm wondering if you didn't accidently get the front and rear spring confused, because on the rear spring you would want the thick end of the shim forward.
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Old 07-15-2007, 07:48 PM   #8
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Originally Posted by spearhunter_1 View Post
I've read this post a dozen times to make sure that I wasn't about to put my foot in my mouth, so here goes. The picture shows the shims below the spring. This would be correct if YJ axles were also below the spring or if it had a SOA conversion. However, ursandal is speaking of a standard 1.5" kit, I'm assuming, and therefore the shims should be on top of the springs. If the thick end of the shim is above and forward on the front spring it would, in fact, angle the pinion down. I don't know why you would want it angled down. I'm wondering if you didn't accidently get the front and rear spring confused, because on the rear spring you would want the thick end of the shim forward.
Yeah the pic has the shim in the wrong place. The explaination I got was the shims on the front are used to correct the caster. Here's a write up on it.

http://www.jeepfan.com/tech/CasterCamberToe.htm

The shimmed leafs are the front, no shims came on the rear. When I took of the old leafs I could tell there were some shims in there although they were totally rusted out and crumbling so no way of determining how they were sitting in there.

I have since installed the lift with the shims installed thick end forward and there appears to be no ill effects. The wheel returns to center as it should and it tracks perfect. Probably could have gotten away w/o using them but I figure they put them on there for a reason.

Al
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Old 07-15-2007, 09:26 PM   #9
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Ahhh...I see. Kind of rolls the axle out so the vertical centerline of the wheel is slightly forward of it's attaching point, forcing it to return to center on it's own. Good info...thanks for the link. I'll be installing my lift this coming weekend, so I'll now go into it with a little more info.

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