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Old 06-30-2010, 02:08 PM   #1
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Installed lift, Drive line vibes, might need shims

I just installed a set of RC 2" AAL's. I know that many serious offroaders are not AAL fans. They seemed to be the right choice for my situation. They don't ride bad at all and I actually think it rides a little better that the old saggy springs. I got at least 2" of lift and the Jeep looks great.
Now for the issue: as I have read about other lift installs, I am now feelling a slight vibration. It is steady when cruising but increases when I let off the gas to slow down. 3rd gear seems to be the worst. I know that shims will help. I have searched the topic here on WF but I still have not figured out exactly how to install them. Do I want to install them so as to increase the angle of the drive shaft or so as to straighten the angle? It makes sense to me to rotate the front of the rear axle up so as to reduce the angle. Am I correct? See crude drawing:
Also how many degrees of shim?
Any other thoughts will be appreciated as well.


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Old 06-30-2010, 03:04 PM   #2
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Why not do a TC Drop kit? Use some spacers on your TC skid plate a there you go, no shims needed.

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Old 06-30-2010, 03:27 PM   #3
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TC drops are easy and do indeed work.

also, get your alignment checked. a poor caster angle will cause vibes, and all lifts screw up alignment.

it's not so much the driveshaft angle itself, it's the fact it needs to be close to what the pinion is. generally you sacrifice handling a bit to get a better DS angle by manipulating the caster.

I'd try that first before you jack around with the TC. if you can't find that magic angle where handling(no bumpsteer, shimmy's or DW), DS(no vibration), and pinion live in harmony, by all means do a TC drop next.
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Old 06-30-2010, 03:37 PM   #4
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I went to firestone and bit the bullet the first time. I spent $120 on my first alignment but now i get them free for the life of the vehicle. Thats a good deal if you ask me. The service manager didn't want to do it cause it's obvious I wheel mine, but I talked him into it.
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Old 06-30-2010, 03:57 PM   #5
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Quote:
Originally Posted by YJoey View Post
I went to firestone and bit the bullet the first time. I spent $120 on my first alignment but now i get them free for the life of the vehicle. Thats a good deal if you ask me. The service manager didn't want to do it cause it's obvious I wheel mine, but I talked him into it.
that is a pretty good deal. especially for anyone that enjoys big tires, lifts, and screwing around with suspensions

I don't own a YJ, so I can't remember if they have cam bolts for making caster adjustments. would the OP need to shim, purchase cam bolts, or do YJ's have them? I for the life of me can't remember.
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Old 06-30-2010, 04:45 PM   #6
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Yj's dont have caster adjustments from what i've read. Ive hears something about buying offset ball joints or something like that. Im not an expert on them yet. Im sure I will replace them soon though.
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Old 06-30-2010, 05:14 PM   #7
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ball joints will mess with camber. I've never heard of castor ones. I suppose it's possible.

I think you're right though with the caster not being adjustable. you guys use longer shackles to make the adjustment.

I'm losing it. I was thinking CJ's needed longer shackles, and YJ's from like 92 or something got cam bolts. now that I think more about it, that started with TJ's.

screw that caster and get the TC drop
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Old 07-01-2010, 08:43 AM   #8
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Quote:
Originally Posted by GroundHawg View Post
ball joints will mess with camber. I've never heard of castor ones. I suppose it's possible.

I think you're right though with the caster not being adjustable. you guys use longer shackles to make the adjustment.

I'm losing it. I was thinking CJ's needed longer shackles, and YJ's from like 92 or something got cam bolts. now that I think more about it, that started with TJ's.

screw that caster and get the TC drop
Yeah my bad I meant camber. Exactly I say the TC drop is the way to go. Or just go get some 1" steel tubing, paint it black, and use that. With longer bolts of course.
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Old 07-01-2010, 09:03 AM   #9
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TC drop is negative progress... so I'd try other things before that.

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