2in Mopar lift concerns! (Solved)

[yokramer]

Or maybe the excessive amount of swingers in the back

I mean its gonna wobble but it wont be the death kind.

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[Remorseless]

I mean its gonna wobble but it wont be the death kind.

Depends on who's invited... and what kind of access you got to a clinic...

 

[kah.mun.rah]

Someone press the descent control button. This thread is headed downhill quite rapidly.

 

[Remorseless]

Someone press the descent control button. This thread is headed downhill quite rapidly.

 

[yokramer]

 

[Remorseless]

 

[yokramer]

 

[Remorseless]

 

[aldo98229]

The thing with these JLs is that they roll off the assembly line at the very limits of their suspension geometry.

FCA essentially took JK’s suspension, gave it a slight lift for added clearance and, voilá, you got JL’s underpinnings. The end result is JL’s famous vague steering in the best of times, but it doesn’t take much to push its geometry over the edge.

I have a JLU with a Mopar lift. I also added a beefier YETI adjustable track bar, a beefier Fox stabilizer and a set of 35s. The Mopar kit includes longer control arms, but they are still insufficient to correct the geometry IMO. You can improve things further by adding a pair of geometry correction brackets, which I don’t have.

The Jeep drives fine. But one time, a year ago now, I was crossing a set of diagonal, heavily rutted train tracks at 35 MPH, and the steering wheel started pulling violently side to side. I had to stomp on the brakes to avoid running into oncoming traffic!

That’s the only time this happened. Subsequently, I have taken the Jeep on three long road trips and haven’t had any other issues. So I think it was just a situation of having a Jeep riding at the edge of its geometry, throw some offset train tracks, and the rest is history.

PS - I recently downsized from 35x12.5 General ATs to 35x11 Nokian AT tires. The new tires are not only narrower and lighter in weight, but have more on-road biased tread. Yesterday I was driving in heavy rain: while the old Generals would have yanked the steering wheel to the side whenever I hit a puddle, the Nokians sliced through completely unperturbed.

I am happy with how the Jeep rides and drives at the moment. But the whole process is more art than science to be honest...

 

[Old Jeeper]

Just got the 2" Mopar lift on top of my 17×8.5 wheels.

Sometimes I'll hit a bump and the whole vehicle will shake and I can feel it in the steering wheel no biggie it's a rush it /feels/ dangerous but it's only momentary.

SOMETIMES though, hitting the same bump at lower speeds causes the jeep to shake and vibrate for extended periods, to where my smile goes away and I start eyeing the hazards button and the shoulder of the road. Genuinely feel like I'm in danger. But then, it will randomly just calm down like nothing happened.

Is this the infamous death wobble?
Or is that just the new suspension breaking in?

(I don't have any other aftermarket parts besides the wheels and lift so far)

I believe you put on the lift and then the shake set in, yes its on the verge of DW. If you did not have the shake before then now you need to adjust you Caster. You will need to got to a shop that KNOWS that caster affects the shake and can dial in the better number. From .5 -1 degree.

You may need to invest in a set of front lower adjustable Lower Control arms.

NOTE if you are on the edge as a result of the lift, you may be able to adjust the psi in your tires to compensate.

What has happened? Your wheelbase has changed, not much but that is where the caster comes into play assuming all other components are working properly, which in you cause most likely they are...

 

[Old Jeeper]

The thing with these JLs is that they roll off the assembly line at the very limits of their suspension geometry.

FCA essentially took JK’s suspension, gave it a slight light for added clearance and, voilá, you got JL’s underpinnings. The end result is JL’s famous vague steering in the best of times, but it doesn’t take much to push its geometry over the edge.

I have a JLU with a Mopar lift. The Mopar kit includes longer control arms, but they are still insufficient for correct geometry IMO. You can improve things further by adding a pair of geometry correction brackets, which I don’t have.

I also added a beefier YETI adjustable track bar, a beefier Fox stabilizer and a set of 35s.

The Jeep drives fine. But pen time, a year ago now, I was crossing a set of diagonal, heavily rutted train tracks at 35 MPH, and the steering wheel started pulling violently side to side. I had to stomp on the brakes to avoid running into oncoming traffic!

That’s the only time this happened. Subsequently, I have taken the Jeep on three long road trips and haven’t had any other issues. So I think it was just a situation of having a Jeep riding at the edge of its geometry, throw some offset train tracks, and the rest is history.

PS - I recently downsized from 35x12.5 General ATs to 35x11 Nokian AT tires. The new tires are not only narrower and lighter in weight, but have more on-road biased tread. Yesterday I was driving in heavy rain: while the old Generals would have yanked the steering wheel to the side whenever I hit a puddle, the Nokians sliced through completely unperturbed.

I am happy with how the Jeep rides and drives at the moment. But the whole thing is more art than science...

You bring up an excellent point: Key word Diagonal.

When you drive over a diagonal surface like train tracks or expansion ruts on bridges etc. This really illustrates Newton's 3rd Law of motion> For every action there is an equal and opposite reaction. At the bottom of the diagonal, your tire hits the rut and the impact goes straight back and almost instantly the opposite tire hit the high side rut. Now they are fighting each other, as the low side tire is recovering, the high side is in play and suddenly you get the hard DW with the steering wheel going back and forth violently sometimes if you are going fast.

Take away: Pay attention to diagonals and slow down as much as the traffic will allow.

 

[Pinky Tuscadero]

It was such a nice pissing contest and then... it was gone ?

 

[Remorseless]

It was such a nice pissing contest and then... it was gone ?

 

[JeepFiend]

I’d definitely recommend returning to whoever installed the Mopar lift kit. Have them re-check all things installed and torque specs for each component.

See, I'd definitely recommend not returning to whoever installed the Mopar lift kit, unless you want something else screwed up. Somebody screws up on my Jeep, I don't take it back to them. History shows, if they FUBARed it once, they'll do it again.

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