LX570 unstable rear axle (1 Viewer)

[Raptora2]

Hi Guys,

I'm new to the LX570 and noticed its suspension feels quite different from my previous LX470.
As far as I know, the main difference is that the LX570 uses front springs and shocks, while the LX470 had torsion bars.
At highway speeds (80+ mph), the LX570—especially the rear—feels noticeably less stable than the LX470.
The suspension was inspected by a local dealer using the FSM tests , but no issues were found. Personally checked oil level and sensors . When fully loaded, the rear end feels like it has excessive spring travel and lacks proper shock absorption. Any thoughts?

BR
Teo

 

[Raptora2]

FYI , System bleeding was performed as well

 

[Raptora2]

That should be the damping function graph...

 

[Heckraiser]

How many miles? Do you feel a difference in damping between normal/sport/comfort? Stock ride height or sensor lift?

Possibilities:
Fluid change interval is 60k
Might need accumulator globe replacements
Rear suspension bushings might be shot
Less likely, but could need new AHC shocks

 

[lx200inAR]

Doesn't appear to be anything abnormal about your techstream output. Has your truck been "Sensor lifted". If so, the unsettled feeling could be your panhard angle. There are correction kits for this if you have it lifted.

I assume you are still on OEM rear springs, and someone didn't swap them out for LC springs or something crazy like that. That would make your rear end way over sprung.

I would be looking for some physical issue.

 

[CanadianRockyCruiser]

Check all of our bushings: control arms, shock eyelets, etc.

Also, it appears you have a lot of height difference between left and right rear. Might want to measure that and check you AHC sensor arms to see where they are adjusted. Adjustments can also be made via the height offset utility in Techstream.

 

[Raptora2]

How many miles? Do you feel a difference in damping between normal/sport/comfort? Stock ride height or sensor lift?

Possibilities:
Fluid change interval is 60k
Might need accumulator globe replacements
Rear suspension bushings might be shot
Less likely, but could need new AHC shocks

Hi Heckraiser,
105k miles, yes car behaves diff on n/s/c modes. Ride height is stock. Shocks are the ones that i suspect, as the actual damping is in globes , so they work. But shocks might have internal leak,because external will be visible?

 

[Raptora2]

Doesn't appear to be anything abnormal about your techstream output. Has your truck been "Sensor lifted". If so, the unsettled feeling could be your panhard angle. There are correction kits for this if you have it lifted.

I assume you are still on OEM rear springs, and someone didn't swap them out for LC springs or something crazy like that. That would make your rear end way over sprung.

I would be looking for some physical issue.

Hi Lx200 , How to recognize the LX570 oem springs? Thanks mate.

 

[Raptora2]

Something really important to consider. I bought the car with LPG/GPL tank (250lbs full) instead spare tyre which means i have some difference? How would you proceed dears?

 

[lx200inAR]

So you are saying you have an auxiliary tank where the spare tire would normally be? That could be contributing, but that's not much different than having an adult sitting in the 3rd row.

Can the truck go into low mode? I see from your printouts that it went into high, but doesn't look like low was tested, or it doesn't get there. If you can get into low mode, then you most likely have the correct LX springs.

 

[Raptora2]

So you are saying you have an auxiliary tank where the spare tire would normally be? That could be contributing, but that's not much different than having an adult sitting in the 3rd row.

Can the truck go into low mode? I see from your printouts that it went into high, but doesn't look like low was tested, or it doesn't get there. If you can get into low mode, then you most likely have the correct LX springs.

Yup can go low, but fwd seems way lower than rear even on low set...

 

[lx200inAR]

Yup can go low, but fwd seems way lower than rear even on low set...

Well, then that brings more questions than it answers. Do you have the sensor values from when in low? That will tell you if the rear is actually dropping. If you bleed the rear globes the rear should drop as well. That would be another way to test. If it was sitting on non AHC springs, they would hold the weight of the truck up rather than letting it fall when the hydraulic system is depressed. You'd still be able to lift because the hydraulic system would come back into play.