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Unread 10-28-2015, 02:08 PM   #1
somedude922
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Axle degree shims

Have stock width leaf spring in my 79 cj7. I ordered rubicon express 2.5" wide shims. Will they fit? I didn't see a 2" wide shim. Trying to correct caster angle.

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Unread 10-28-2015, 02:14 PM   #2
Renegade82
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No, they won't fit between the Ubolts. Warrior Products makes steel 2" wide shims. I know Quadratec sells them.
http://www.quadratec.com/products/16121_0907.htm
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Unread 10-28-2015, 10:58 PM   #3
John N
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Be sure that whatever brand you buy, get steel shims. The aluminum ones are worthless, they crack, wear and cause the u-bolts to loosen up.
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Unread 10-29-2015, 09:19 AM   #4
HackFabrication
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I ordered these in 6* for my 76 CJ5:

http://www.wfoconcepts.com/cr/Axle-Shims/3225
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Unread 10-29-2015, 12:17 PM   #5
somedude922
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Thanks! I'm going to order the 8* shims from WFO. Quadratrac only had up to 6* shims.

I'm sitting at -3* caster angle so 8* will work good.
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Unread 10-29-2015, 03:32 PM   #6
HackFabrication
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Quote:
Originally Posted by somedude922 View Post
I'm sitting at -3* caster angle so 8* will work good.
Wow! Are you sure that is a full 3 degrees negative and not .3 degrees?

Reason I'm asking, is my 76 CJ5 with a 2.5" BDS lift was at -.3 and -.6 caster without shims. The 6 degree shims will put me within the factory spec of 5-7 degrees positive caster.
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Unread 10-29-2015, 03:45 PM   #7
Matt1981CJ7
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Yeah, I agree with Hack, something is amiss if your caster is a full 3 degrees negative.

Technically, lift springs alone should not change caster angle, if the eye-to-eye dimension of the springs is correct.

Longer eye-to-eye springs, like YJ springs, or longer shackles will change caster.

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Unread 10-29-2015, 04:36 PM   #8
Renegade82
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Quote:
Originally Posted by Matt1981CJ7 View Post
Technically, lift springs alone should not change caster angle, if the eye-to-eye dimension of the springs is correct.
Matt
Not necessarily true. It depends on how the arch is bent and if they provided a flat area at the spring perch. I've put on brand new Rough Country springs once and it changed the caster. Now granted, they were RC's.
Let's just say "when designed correctly, lift springs should not change caster".
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Unread 10-29-2015, 04:39 PM   #9
Matt1981CJ7
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Quote:
Originally Posted by Renegade82 View Post
Not necessarily true. It depends on how the arch is bent and if they provided a flat area at the spring perch. I've put on brand new Rough Country springs once and it changed the caster. Now granted, they were RC's.
Let's just say "when designed correctly, lift springs should not change caster".
That's a better way to phrase it.

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Unread 11-03-2015, 09:35 AM   #10
somedude922
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Sorry it took a bit to get back.... I haven't ordered any shims yet. Yes I checked the angle my self and it was -2.x. I didn't believe it either. Took it to an alignment shop and their printout was: image-3874984342.jpg So....I think I have a mildly bent drivers front spring. So would it throw caster off that much? I also have a CV shaft, would using shims cause me vibration? Granted this jeep hasn't seen much road time but I am wanting to flat tow it and the test tow was a nightmare. I turned right and the jeep went full turn left. I figured I would work on the caster angle first. Ball joints and most steering parts are in good order.
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Unread 11-03-2015, 12:01 PM   #11
Fourtrail
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Seeing the -3* caster and the fact that you said it had a CV shaft, then the correct way to fix the caster is to cut and turn the knuckles. You have the -3* because the axle has been modified/shimmed to get the pinion to point at the front output yoke to use a CV style drive shaft. Can you get a picture of the front suspension/axle so we can take a look to make a better informed guess?
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Unread 11-03-2015, 01:37 PM   #12
somedude922
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I was incorrect. I do not have a CV shaft. It also appears this is not the stock angle either, which I knew but was hoping the shims might help. CUt and turn is not really an option at this time or the near future.....


image-190361134.jpg
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Unread 11-03-2015, 01:38 PM   #13
somedude922
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image-1801027652.jpg
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Unread 11-03-2015, 01:39 PM   #14
somedude922
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image-963565122.jpg
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Unread 11-03-2015, 01:56 PM   #15
CSP
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Do you have long front shackles?


Are the shackles at the front of the front springs or the rear?
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