Does Jacking Stress CV Axle?

[Phimosis]

What a wonderfully articulate & educational post on this topic - thank you for your insights!

Btw, I meant the entire assembly “stretches” like my finger stretches when I pull on it. Sometimes I’ll get an audible “pop” when I pull & feel the give of the cartilage when pushing back into place. Probably the equivalent of a tulip shape in there somewhere. Man’s designs mimicking Nature’s.

There’s one thing that not quite right though. Where he says:

“Now let’s say you raised the ride height two inches, and that means the CV can only extend 4mm but can collapse 16mm. This means that every time the suspension is at full extension, the CV axle is now the limiting factor instead of the droop stops.”

That’s only true if you buy lift kit that will give you more down travel, or increased droop. What prevents down travel in the Maverick is the top-out bumper inside of the shocks. The shock length is specifically designed to prevent over extension, or telescoping, of the cv joint, which could pull it apart. If you have a lift kit that uses the stock shocks, your cv joints will never extend beyond their intended travel range.

If you have a lift kit with aftermarket shocks that were designed carelessly, with too much droop, then yes, they could overextend your cv’s and destroy them. I can’t vouch for the lift kit makers, but you’d think that their engineers are competent enough to understand these concepts and design their shocks accordingly.

Sponsored

 

[Robot-Wrangler]

Does jacking a tire off the ground put stress on a CV axle? AI tells me “Yes” - especially on a compromised CV axle….

Maybe I should rotate my tires less often than Ford recommends?

Maybe the Tremor’s axles are designed differently to handle the droop of having a tire hanging off the ground while off-roading?

Edit…Grok AI

“When you jack up a car, the suspension droops, and the CV axle may extend to its maximum range of motion. This can place stress on the CV joints, especially if the car is lifted unevenly or excessively, causing the axle to angle sharply.

Lifting just one wheel (e.g., with a floor jack) can cause the CV axle on that side to extend more than usual, increasing stress on the joints. This is especially true for front-wheel-drive or all-wheel-drive vehicles where CV axles are critical components.

If the CV axle, joints, or boots are already worn or damaged, jacking the car may exacerbate existing issues, potentially leading to noise (clicking/popping), vibration, or failure.”

The engineers at Ford allow for full suspension travel when designing CV axles. Jacking up one wheel with a floor jack is harmless unless you damage the lower control arm.

Installing a lift kit such as the Rough Country 2.5" full kit with rear springs and front struts will increase the angular travel of the CV axle as it rotates and as the balls in the CV joint have to travel a greater distance in the same amount of time, their velocity is increased. So yes, there will be a slightly shorter life span, but not instantaneous failure.

I have the aforementioned kit and as of yet have no issues, just a better ride.

 

[Timothyd]

The engineers at Ford allow for full suspension travel when designing CV axles. Jacking up one wheel with a floor jack is harmless unless you damage the lower control arm.

Installing a lift kit such as the Rough Country 2.5" full kit with rear springs and front struts will increase the angular travel of the CV axle as it rotates and as the balls in the CV joint have to travel a greater distance in the same amount of time, their velocity is increased. So yes, there will be a slightly shorter life span, but not instantaneous failure.

I have the aforementioned kit and as of yet have no issues, just a better ride.

Just common sense that the unloaded CV joints will have no problems moving unloaded. Lift kits might compromise them a little bit but I can't say how much, if any, depending on the lift. Although, the better ride is attractive.

 

[sprubs]

Does jacking a tire off the ground put stress on a CV axle? AI tells me “Yes” - especially on a compromised CV axle….

Maybe I should rotate my tires less often than Ford recommends?

Maybe the Tremor’s axles are designed differently to handle the droop of having a tire hanging off the ground while off-roading?

Edit…Grok AI

“When you jack up a car, the suspension droops, and the CV axle may extend to its maximum range of motion. This can place stress on the CV joints, especially if the car is lifted unevenly or excessively, causing the axle to angle sharply.

Lifting just one wheel (e.g., with a floor jack) can cause the CV axle on that side to extend more than usual, increasing stress on the joints. This is especially true for front-wheel-drive or all-wheel-drive vehicles where CV axles are critical components.

If the CV axle, joints, or boots are already worn or damaged, jacking the car may exacerbate existing issues, potentially leading to noise (clicking/popping), vibration, or failure.”

AI is unreliable at best. You have to go see what sources were used and decide if they are reliable or if even they match what AI claimed.

 

[Phimosis]

AI is unreliable at best. You have to go see what sources were used and decide if they are reliable or if even they match what AI claimed.

AI is only as unreliable as the training data it’s using to formulate answers.

And you can skew the data it uses, based on how you formulate your query. For example, if you formulated a query and told the AI to specifically exclude any training data from Reddit, any user forums (like MTC) or any public message boards and to only use scientific papers or expert opinions to formulate the answers, and if the AI was able to understand those instructions and faithfully execute them, then the AI response would be highly accurate.

Whenever AI is spitting out a garbage answer, that you know is completely false, it is because it read that falsehood somewhere on the internet and the LLM doesn't have the “common sense” to figure out what is credible and what is complete BS.

For example, if you asked AI, “after how
Many miles of driving should I change the oil in my Ford Maverick?” It’s probably going to say 3,000 miles and then cite numerous search results from Maverick Truck Club members as evidence for that fabricated, completely bogus answer. But if you tell the AI to ignore training data from user forums, it’s going to tell you to change the oil when the intelligent oil-life monitor indicates that there is less than 10% oil-life remaining, rather than changing the oil at a specific milage - which is the recommendation from FoMoCo.

How reliable can AI be now? Well, medical doctors use Grok based AI all the time. Look up Mosaic clinical technologies or Mosaic OS. The AI can read medical imaging studies and make medical reports as accurately as board certified medical doctors can. Come to find out, Tesla’s AI (Grok) is very good at image analysis and identification of edge case scenarios. They can make these highly accurate image interpretations because all of their training data came from the previous interpretations of medical studies that were read by board certified medical doctors, and augmented with data from research journals like JAMA, New England journal of medicine, the Lancet and from professional resources like UpToDate and the NCCN cancer guidelines. If you don’t feed the AI any misinformation from Reddit or YouTube, it will be 99.9% accurate.

 

[dalola]

We should probably just enjoy "good 'ol uncle AI" and his quirky ways while we can. Once AGI & ASI kick in, we'll reminisce about the good old days when AI was easy to make fun of....

 

[Tiger Dude]

Zero impact to the CV joint jacking up the truck. It is guaranteed to be fine to the max suspension travel. CV joints are stressed when powered through a large angle, there is zero impct if the wheels aren't turning. Even if you hit the max angle (you won't), you won't break a CV joint with the weight of the wheel and hub.

 

[Timothyd]

AI is unreliable at best. You have to go see what sources were used and decide if they are reliable or if even they match what AI claimed.

You can be replaced.




Me too.

 

[sprubs]

AI is only as unreliable as the training data it’s using to formulate answers.

And you can skew the data it uses, based on how you formulate your query. For example, if you formulated a query and told the AI to specifically exclude any training data from Reddit, any user forums (like MTC) or any public message boards and to only use scientific papers or expert opinions to formulate the answers, and if the AI was able to understand those instructions and faithfully execute them, then the AI response would be highly accurate.

Whenever AI is spitting out a garbage answer, that you know is completely false, it is because it read that falsehood somewhere on the internet and the LLM doesn't have the “common sense” to figure out what is credible and what is complete BS.

For example, if you asked AI, “after how
Many miles of driving should I change the oil in my Ford Maverick?” It’s probably going to say 3,000 miles and then cite numerous search results from Maverick Truck Club members as evidence for that fabricated, completely bogus answer. But if you tell the AI to ignore training data from user forums, it’s going to tell you to change the oil when the intelligent oil-life monitor indicates that there is less than 10% oil-life remaining, rather than changing the oil at a specific milage - which is the recommendation from FoMoCo.

How reliable can AI be now? Well, medical doctors use Grok based AI all the time. Look up Mosaic clinical technologies or Mosaic OS. The AI can read medical imaging studies and make medical reports as accurately as board certified medical doctors can. Come to find out, Tesla’s AI (Grok) is very good at image analysis and identification of edge case scenarios. They can make these highly accurate image interpretations because all of their training data came from the previous interpretations of medical studies that were read by board certified medical doctors, and augmented with data from research journals like JAMA, New England journal of medicine, the Lancet and from professional resources like UpToDate and the NCCN cancer guidelines. If you don’t feed the AI any misinformation from Reddit or YouTube, it will be 99.9% accurate.

AI doesn't "know" or "understand". It's a useful tool, sure, but how quickly people forget that the answers ALWAYS need to be checked. No amount of prompt engineering allows the user clairvoyance here. There are plenty of examples of how AI goes wrong and unfortunately, you can't know for sure if the regurgitated answer came from a good source without checking, even if you asked very nicely.

eta: just searched for a specific fact that would be recent news and google AI flat out made some shit up. Looked at the sources and none of them said what was claimed. good stuff!

 

[DS_Ohio]

you can't know for sure if the regurgitated answer came from a good source without checking, even if you asked very nicely.

eta: just searched for a specific fact that would be recent news and google AI flat out made some shit up. Looked at the sources and none of them said what was claimed. good stuff!

....so you're saying AI is basically my Manager. This is fair.

 

[AutobahnSHO]

AI is only as unreliable as the training data it’s using to formulate answers.

.... If you don’t feed the AI any misinformation from Reddit or YouTube, it will be 99.9% accurate.

Or let shady people access it. Oh wait.

https://www.anthropic.com/research/small-samples-poison

Sponsored