Friends at 6"+ lift, how do you not have vibes? - JeepForum.com
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Unread 01-15-2015, 08:41 PM   #1
mxjosh
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2004 WJ 
 
Join Date: Sep 2013
Location: Toledo, OH
Posts: 263
Friends at 6"+ lift, how do you not have vibes?

I currently have an IRO 6.5" critical path kit with a double cardan front shaft and can't get rid of my vibes. I know some are from the rear, but I plan on going with an IRO A-arm to help Center my axle and set pinion angle, but I know some are from the front shaft as well. I have my caster set at 4 degrees (recommended). I've heard with a double cardan you should be able to set your caster and not have to many issues with your pinion angle with that shaft. Is this just a completely false statement? I have all new u-joins BTW. Just looking for suggestions.....

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2004 WJ
4.7 HO
IRO 6.5" CP/ RC 3/4" spacers/ Bilstien 5100's
18x10 Moto Metals 33" Duratracs
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Unread 01-16-2015, 12:39 AM   #2
MoonyJohn
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2004 WJ 
 
Join Date: Feb 2008
Location: West Linn, Oregon
Posts: 6,858
Quote:
Originally Posted by mxjosh View Post
I currently have an IRO 6.5" critical path kit with a double cardan front shaft and can't get rid of my vibes. I know some are from the rear, but I plan on going with an IRO A-arm to help Center my axle and set pinion angle, but I know some are from the front shaft as well. I have my caster set at 4 degrees (recommended). I've heard with a double cardan you should be able to set your caster and not have to many issues with your pinion angle with that shaft. Is this just a completely false statement? I have all new u-joins BTW. Just looking for suggestions.....
Are you just running the rear a arm spacer at the moment? A new a arm wont help center the axle. There is nothing to center, theres no track bar. The adjustability of the iro a arm would help reduce rear vibes though. As for the front im not 100% sure. I ran almost 7" of lift in the front of my old wj and never had any problems. Is your pinion set to the max for the a arm?

Kind of bad picture. But its what mine was set at



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Unread 01-16-2015, 04:54 AM   #3
mxjosh
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2004 WJ 
 
Join Date: Sep 2013
Location: Toledo, OH
Posts: 263
Sorry I should have specified, I meant center the rear wheels in the wheel well, not center the axle left to right. I have my caster bracket maxed out in the opposite direction in order to run 4 degree of caster. How is it that our brackets are maxed out completely opposite? What was your caster setting? Did you have any vibes or wander? I'm running over 7" lift in the front (6.5" springs + 3/4" spacers). Did you use the transfer case drop? I don't current have mine installed because I heard not to use it.
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2004 WJ
4.7 HO
IRO 6.5" CP/ RC 3/4" spacers/ Bilstien 5100's
18x10 Moto Metals 33" Duratracs
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Unread 01-16-2015, 10:25 AM   #4
MoonyJohn
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Quote:
Originally Posted by mxjosh View Post
Sorry I should have specified, I meant center the rear wheels in the wheel well, not center the axle left to right. I have my caster bracket maxed out in the opposite direction in order to run 4 degree of caster. How is it that our brackets are maxed out completely opposite? What was your caster setting? Did you have any vibes or wander? I'm running over 7" lift in the front (6.5" springs + 3/4" spacers). Did you use the transfer case drop? I don't current have mine installed because I heard not to use it.
Could you get a picture of yours?

I couldnt tell you the degree of caster because I dont have that jeep anymore, but I never had any problems with it set at that.

Just curious if there is a reason your running 3/4" spacers on top of 6.5"? 33's should fit perfectly without the spacer. That would help vibes out on its own if the spacer was out. I never installed the TC drop either. Whats the point of lifting your belly ground clearance and then dropping it back down another inch?
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Unread 01-16-2015, 11:56 AM   #5
mxjosh
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I'll snap a pic when I get home. The only reason for running the 3/4" spacer was to go for a more level look, nothing to do with tire fitment. You didn't have any wandering issues with that setup up (due to poor caster)?

As far as the TC drop, I would sacrifice the inch of clearance to improve drive-ability if I know for sure it will help vibes. But everyone seems to say it will only help the rear not the front, I can't understand how that is from trying to picture it in my head, maybe I would have to crawl under and take a look, but how would it not help both front and rear angles if the whole thing is dropped an inch?
__________________
2004 WJ
4.7 HO
IRO 6.5" CP/ RC 3/4" spacers/ Bilstien 5100's
18x10 Moto Metals 33" Duratracs
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Unread 01-16-2015, 02:41 PM   #6
MoonyJohn
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Join Date: Feb 2008
Location: West Linn, Oregon
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Quote:
Originally Posted by mxjosh View Post
I'll snap a pic when I get home. The only reason for running the 3/4" spacer was to go for a more level look, nothing to do with tire fitment. You didn't have any wandering issues with that setup up (due to poor caster)?

As far as the TC drop, I would sacrifice the inch of clearance to improve drive-ability if I know for sure it will help vibes. But everyone seems to say it will only help the rear not the front, I can't understand how that is from trying to picture it in my head, maybe I would have to crawl under and take a look, but how would it not help both front and rear angles if the whole thing is dropped an inch?
Gotcha, I did that too actually but needed the room for 35s

It never drove poorly, only in the wind lol. Maybe try the TC drop before you spend the coin on the A arm.. might be your ticket. Im not sure what people are talking about making it only help the rear?
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Unread 01-16-2015, 02:56 PM   #7
mxjosh
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2004 WJ 
 
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Location: Toledo, OH
Posts: 263
Quote:
Originally Posted by MoonyJohn View Post
Gotcha, I did that too actually but needed the room for 35s

It never drove poorly, only in the wind lol. Maybe try the TC drop before you spend the coin on the A arm.. might be your ticket. Im not sure what people are talking about making it only help the rear?
Well I would really like the A-arm to get the rear wheels back in the middle of the wheel well so it can flex and not rub like crazy. Right now my rear wheels are a half inch from my side skirts due to pinion angle. I have lower adjustable control arms right now.
__________________
2004 WJ
4.7 HO
IRO 6.5" CP/ RC 3/4" spacers/ Bilstien 5100's
18x10 Moto Metals 33" Duratracs
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Unread 01-16-2015, 02:58 PM   #8
MoonyJohn
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2004 WJ 
 
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Location: West Linn, Oregon
Posts: 6,858
Quote:
Originally Posted by mxjosh View Post
Well I would really like the A-arm to get the rear wheels back in the middle of the wheel well so it can flex and not rub like crazy. Right now my rear wheels are a half inch from my side skirts due to pinion angle. I have lower adjustable control arms right now.
Ah, well the lowers will be the main adjutable part, and the uppers will fix the angle. Mine ran like that for a long time, never rubbed. Looks like its going to but it wont. Push it back too much and the rear bumper will need to be trimmed.
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