Bad wobble at 40 mph
Thread Starter
JK Newbie
Joined: Jan 2009
Posts: 30
Likes: 0
From: Davie, Fl
Bad wobble at 40 mph
4dr auto with tera 3.5 lift, upper and lower arms, did the lift myself and been on for 6 months. Just rotated the tires and bad wobble. Tires were checked by putting stock tires back on, still have the wobble.
What is the right way to set up the front??? After much reading I am still not sure what to do. Do I angle the axle to 4 degrees or leave it stock? If stock setting why buy adjustable arms? I never took it in for an alignment because each tech tolld me a different story. I have read the installs but after reading all the different answers I am more unclear on how to set up front now.
Yes everything is tight, nothing broken, have not wheeled hard and had a slight wobble from day one. Just figured it was the supper aggressive tires I had. Sorry for the long post but I am unable to safely drive jeep now.
Any help is appreciated.
What is the right way to set up the front??? After much reading I am still not sure what to do. Do I angle the axle to 4 degrees or leave it stock? If stock setting why buy adjustable arms? I never took it in for an alignment because each tech tolld me a different story. I have read the installs but after reading all the different answers I am more unclear on how to set up front now.
Yes everything is tight, nothing broken, have not wheeled hard and had a slight wobble from day one. Just figured it was the supper aggressive tires I had. Sorry for the long post but I am unable to safely drive jeep now.
Any help is appreciated.
JK Jedi Master
Joined: Jan 2008
Posts: 11,463
Likes: 165
From: Austin <--> Colorado Springs
Just rotated the tires and bad wobble. Tires were checked by putting stock tires back on, still have the wobble.
Or the bad wobble was always there, and you rotated to try and get rid of it?The trackbar is tightened to spec, appx 125 ft/lbs? And you tightened all the bolts with the full weight of the jk on the ground, not on a lift or jacked up at all? You may also want to pull the trackbar off and check the mounting holes, they may be wallowing out letting the bar slip back and forth.
From the FAQ's up top:
Q: What is Caster? How much do I need?
A: Caster is the angle upon which your front axle sits at in order to help keep your Jeep driving straight. Positive caster, which is what you want, will cause your axle to sit in a way that your pinion shaft will be dipping ever so slightly towards the ground. Too little or even negative caster angle can cause your Jeep to wander and feel 'flighty' or 'darty' as I've heard some people call it. From the factory, your JK will have +4.2° of caster and if you lift it and install larger tires, you will need to increase this amount to help compensate for the modifications. At 3"-4" of lift, I have found that +6°~8° of caster will do wonders to help improve the handling of your Jeep JK Wrangler.
A: Caster is the angle upon which your front axle sits at in order to help keep your Jeep driving straight. Positive caster, which is what you want, will cause your axle to sit in a way that your pinion shaft will be dipping ever so slightly towards the ground. Too little or even negative caster angle can cause your Jeep to wander and feel 'flighty' or 'darty' as I've heard some people call it. From the factory, your JK will have +4.2° of caster and if you lift it and install larger tires, you will need to increase this amount to help compensate for the modifications. At 3"-4" of lift, I have found that +6°~8° of caster will do wonders to help improve the handling of your Jeep JK Wrangler.
http://project-jk.com/jeep-jk-write-...-end-alignment
Start with the 'setting your caster' section. -Run down to your local hardware store and pick up an angle finder. Put it under the C's on both sides and see what the numbers are. As indicated, stock caster is around 4. After a lift, it's probably down around 3? There is not 'magic' number, so mess around with a few different settings and see which gives you the best ride with no driveline vibes.
Last edited by nthinuf; Dec 15, 2009 at 07:46 AM.
