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post #1 of (permalink) Old 09-23-2001, 05:16 PM Thread Starter
 
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AXLE DEGREE SHIMS Please Help

Hey,

sorry to come over here but i figured that you cj guy would know this. I am going to 7" of lift in my 88 cherokee. I have a question about degree shims. I am using a 2" shackle lift, 4.5" leaf packs, 1/2" block, and 3deg shims. I need to know the order in which i install them. I have heard 2 different answers, here's my options,

1- shims then blocks, then leaf pack

2- blocks then shims then leaf pack.

if you guy could help that would be great

Thanks,

Todd




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post #2 of (permalink) Old 09-23-2001, 05:23 PM
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Re: AXLE DEGREE SHIMS Please Help

1st off blocks are a bad idea as they are prone to breakage and/or cracking but if you must, then do 'em. The shims need to be against the spring perch. Thus being the spring(on top), block, shim and finally the axle.

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post #3 of (permalink) Old 09-23-2001, 05:24 PM
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Re: AXLE DEGREE SHIMS Please Help

Sorry but I just noticed that the blocks were 1/2" therefore they wouldn't be too bad. Hope it helps. Ben

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post #4 of (permalink) Old 09-23-2001, 05:26 PM Thread Starter
 
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Re: AXLE DEGREE SHIMS Please Help

thakns for the quick reply. Also i just though of this. does the tall part of the shims go towards the front or the rear? BTW the blocks are only 1/2" and SOLID steel, but thanks for the concern.

Thanks Again,

Todd




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post #5 of (permalink) Old 09-23-2001, 05:33 PM
 
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Re: AXLE DEGREE SHIMS Please Help

Tall part of shim goes to rear. Also I agree with JpShp on the order. And if this is your first lift make sure you're really carefull when taking the bolts out of the leaf springs in the back. The nuts in the uni-body like to break off. Then out comes the torch. BTW what type of lift kit did you go with? I just put on a Rubicon Express 4.5 on my friends cherokee. REALLY nice kit.

Seth

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post #6 of (permalink) Old 09-23-2001, 06:11 PM
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Re: AXLE DEGREE SHIMS Please Help

Actually, "it depends" is the answer to which way the degree shims go in. You want the transfer case output and the axle pinion parallel to each other. If you use a transfer case drop bracket, the transfer case output will now be angled down a little more. If the axle gets moved straight down without being rotated, the shims will need to be installed to point the pinion up the same amount the transfer case output was rotated down.

Since you are installing longer shackles, the shackles are going to rotate the pinion up a little. If you are also not dropping the transfer case output, you would probably install the shims with the thick side forward to rotate the pinion back down to keep it paralled with the transfer case output.

My suggestion would be to install the lift and measure the transfer case output and the pinion with the weight of the vehicle on the ground. Then figure out if you need the shims and in which orientation. This is much better than guessing.

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post #7 of (permalink) Old 09-23-2001, 10:49 PM
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Re: AXLE DEGREE SHIMS Please Help

You may want to rethink the 3 deg shims, and go with something like 6 deg or 8 even. My XJ is lifted about 4.5 inches over stock, and I am using 3 deg shims. The vibration is still there, but much less than without the shims. The pinion angle and t-case are off by about 1.5 degrees, which I can live with for now.

If you are lowering the t-case a couple inches, you will prob be ok with 3 deg., but if not... may be in for some suprises.

--pm

post #8 of (permalink) Old 09-24-2001, 06:17 AM
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Re: AXLE DEGREE SHIMS Please Help

He does have like a 2" shackle! I bet that took a few degrees of the shim needed. I run at 6" or so and have the Sye,4 degree shims,and 3/4" shackle and have no vibs except at like 2 MHP. Before i installed the shackle I had no vibs then either. Hope it works out man and keep us posted! SCRAM



post #9 of (permalink) Old 09-24-2001, 10:04 AM Thread Starter
 
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Re: AXLE DEGREE SHIMS Please Help

Guys,

Thanks for all the help. I got it all done last night, took until 3am but what the hell right. Anyway i did it in the order you guys said to, shims, blocks, leafs. Worked great. I put the tall part towards the front of the jeep, to tilt the diff up, and correct the angle. It worked great.

Here's the lift details, bear in mind the front's not in yet.

Front- 4.5" RE coils, 2" RE spacers. (currently has 3" coils) Maybe some 1/2 poly stock spacers, to compensate for the list in the rear. (instead of 7" in the rear it came out to 9")

Rear- 4.5" Rusty's leaf packs, 2" rusty's shackles, 1/2" solid steel blocks, 3deg shims. Putting this in last night was a BITCH... I had some stripping problems on the u-blocks, cause i had to cut them to fit. Anyway it's done now. Looks dumb now with the 31's, time for 33's or 34's

Thanks Again,

Todd




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