Statistics/Poll Thread: Front driveshaft CV joint failures

[Zimm]

the data in the poll is fun but useless and subject to selection bias. The only good data is going to be the warranty claims with the mileage of the fail. It would be nice if they were collecting lift data with the claims but who knows. Highway miles v offroad? Doesn't matter. They just need to look at this rig, and see what the trend is as miles stack up.

Mine is just a stock DD, and it failed at 22k and 2.3* caster..

 

[Phobiac]

the data in the poll is fun but useless and subject to selection bias. The only good data is going to be the warranty claims with the mileage of the fail. It would be nice if they were collecting lift data with the claims but who knows. Highway miles v offroad? Doesn't matter. They just need to look at this rig, and see what the trend is as miles stack up.

Mine is just a stock DD, and it failed at 22k and 2.3* caster..

Looking at the scraped data I think I gleaned some interesting information even with selection bias. Nice to have visibility to something if you are dealing with this issue

Ineos changed the part number. You don't change a part number on something that isn't broken.

Currently you could assume that qarranty coverage depends on geography. In Australia, lifted Grenadiers are getting full warranty coverage, even with aftermarket suspension. In the US, stock vehicles get covered while lifted vehicles with the identical failure mode get denied. Same boot. Same tear. Same mileage. Different answer.

The self-repair population is invisible to INEOS. Some owners never file a claim, they assume their lift disqualifies them and buy a $200 TeraFlex.

You're right that what actually matters is the survival curve. Boot integrity as a function of miles/cycles at a given CV angle. That data is much harder to get!

 

[Dokatd]

I

Looking at the scraped data I think I gleaned some interesting information even with selection bias. Nice to have visibility to something if you are dealing with this issue

Ineos changed the part number. You don't change a part number on something that isn't broken.

Currently you could assume that qarranty coverage depends on geography. In Australia, lifted Grenadiers are getting full warranty coverage, even with aftermarket suspension. In the US, stock vehicles get covered while lifted vehicles with the identical failure mode get denied. Same boot. Same tear. Same mileage. Different answer.

The self-repair population is invisible to INEOS. Some owners never file a claim, they assume their lift disqualifies them and buy a $200 TeraFlex.

You're right that what actually matters is the survival curve. Boot integrity as a function of miles/cycles at a given CV angle. That data is much harder to get!

I really don't think the part number change reflects any meaningful actual part change. It could just be a different sub manufacturer or something. Externally they are identical more or less. The joints being used have been in production for some 20yrs or maybe more. And these joints failed even before the Grenadier in identical fashion.

And you are right about self repair, but.... I did mine out of warranty because it was easier for me. And hell my dealership is only 15min away. It's not a fault of the dealer, it's a matter of my time and energy. I was able to swap mine over in less time than it took to drop truck off and deal with service. Plus it helped me get to know the Grenadier better etc. And additionally I didn't have to unload all my crap and move it to a loaner or just generally be without my truck for a week or so.

 

[MrMike]

The factory boot feels "dryer" and less pliable than the replacement, the factory shaft had been painted which may be the cuase of the dryness from over spray, but they feel very different to touch

 

[Commodore]

The factory boot feels "dryer" and less pliable than the replacement, the factory shaft had been painted which may be the cuase of the dryness from over spray, but they feel very different to touch View attachment 7923019

They are are basically the same. As @Dokatd has proven, the primary cause of the damage is from the boot being crushed between the shaft and the metal collar. It isn’t really a playability issue as much as a clearance/contact issue.

 

[MrMike]

They are are basically the same. As @Dokatd has proven, the primary cause of the damage is from the boot being crushed between the shaft and the metal collar. It isn’t really a playability issue as much as a clearance/contact issue.

I understand what you are saying, but the rubber is quite a different compound. If what he says is true, then why are non lifted Grenadiers boots failing?

 

[Dokatd]

I understand what you are saying, but the rubber is quite a different compound. If what he says is true, then why are non lifted Grenadiers boots failing?

Non lifted trucks still pinch. Pinching occurs as you reach the extent of suspension travel. Lifted trucks are constantly living closer to this extent. That's why lifted trucks are having problems more frequently. Add in longer shocks and yeah the problem is amplified even more over stock.

There is no real debate on if stock boots are slightly different than the Terra boot. But both stock boots and Terra boots last more or less the same number of miles under the same conditions. This makes the debate fairly moot.

 

[CrazyOldMan]

Just got back from Knauz. Nothing special about the failed CV boot - torn boot just above the shaft, same as everyone else. Disappointing that it was only 34,000 miles on a stock Grenadier (no lift, stock tires) - I suppose if I babied it more offroad and on speed bumps, it would have lasted somewhat longer, but eventually would have failed all the same. It kind of undermines the premise of the Grenadier - I would have expected it to be tougher. Guess we have to think of this more like tires - a wear and tear part.

 

[MrMike]

Just got back from Knauz. Nothing special about the failed CV boot - torn boot just above the shaft, same as everyone else. Disappointing that it was only 34,000 miles on a stock Grenadier (no lift, stock tires) - I suppose if I babied it more offroad and on speed bumps, it would have lasted somewhat longer, but eventually would have failed all the same. It kind of undermines the premise of the Grenadier - I would have expected it to be tougher. Guess we have to think of this more like tires - a wear and tear part.

Thats what I'm thinking, it's going to be a consumable part.

 

[Zimm]

The issue being, where ya gonna be when it consumes itself. Nothing like an unpredictable consumable.

 

[Dokatd]

The issue being, where ya gonna be when it consumes itself. Nothing like an unpredictable consumable.

Put a lift on and it becomes pretty predictable Every 7,000mi almost on the dot for me.