Hello. Has anyone seen a control arm fail like this? These were installed at the end of 2019, the heavy duty control arm polybush set from Lucky8. It ripped the CV shaft straight out! Luckily we were pulling out of a parking spot when it happened and not driving along the highway. We do not do any off-roading in the LR4, only pavement daily use, in the Midwest.
Control arm fail
- Thread starter lmwong
- Start date
-
- Tags
- bushings control arm lr4 polybush
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
16FujiDisco
Full Access Member
Wow! Never seen anything like that, glad you are all OK
itsaguything
Full Access Member
Wouldn’t have expected that part to be under so much pressure… unless of course, another example of cheap cr.. “made in …..”
I think there was something similar with one of the offroad guys in this forum but this is really bad; there was also discussion around the polybush and how stiff they are. Overly stiff is not good as it can increase the load on the control arm and lead to a fatigue failure on the control arm. I am concerned that this happened with on-road usage! Obviously you need a replacement (on both sides) and personally I'd go back to OEM; with OEM components they've been engineered with stress and fatigue in mind; I'm not sure if the same can be said for after market components? Glad you're OK.
Rover Range
Full Access Member
Looks like the arm rusted through.
As others have indicated, this seems to be associated with poly bushings. Whether the failure is caused by the bushing stiffness or by aftermarket control arms that might have come with them is anyone’s guess.
i went back to stock bushings on mine, and I don’t regret it.
i went back to stock bushings on mine, and I don’t regret it.
ugmw177
Well-Known Member
wow, that is scary. I use the Meyle HD [rubber busings] LCAs. Never had issues. Which brand were these wtih the poly bushings?
Looks like it may have failed close to a weld (see 1 in the image); I don't think it's rust given how clean the edge of the crack is (see 2 in the image):
An area around a weld is typically a harder area and more susceptible to fatigue, it really depends on the technology of the weld, was it cooled quickly, etc.
An area around a weld is typically a harder area and more susceptible to fatigue, it really depends on the technology of the weld, was it cooled quickly, etc.
powershift
Full Access Member
That looks expensive with the half-shaft broken off like that too. Be sure to change both control arms to OEM parts and not just the one that failed.
