Statistics/Poll Thread: Front driveshaft CV joint failures

[Tazzieman]

That’s definitely where the “reliable and bulletproof” image takes a big hit.

Even bulletproof armour doesn't stop bullets. Ask Elon how he knows

 

[CrazyOldMan]

im hurt.

We know that deep down, you are a sensitive and artistic soul

 

[Commodore]

Ok… we do a group buy of teraflex joints…. Like…. A lifetime supply up front. 10 each. We get a price of 100 bucks per or less, and every oil change you do your joint.

Crown already makes the same CV for under $100.

Crown Automotive 68272524FRK Crown Automotive CV Joint Repair Kits | Summit Racing

Free Shipping - Crown Automotive CV Joint Repair Kits with qualifying orders of $109. Shop CV Joints at Summit Racing.

www.summitracing.com

 

[Gajep71]

Have my lift removed and a new front drive shaft installed by Regal. I will give this new setup (for me, vehicle had the 1.7/1.2 lift when I bought it) a chance, but if it fails again within 10k miles and no solution has been found to the issue of CV failures, I probably will have to look at another overland vehicle.

How did you make out after removing the lift? I have the same lift you have, and I'm having to replace the upper rear Rzeppa joint every 8,000 miles. I drive 1000 per week so it's pretty frequent.

 

[jvkintheusa]

How did you make out after removing the lift? I have the same lift you have, and I'm having to replace the upper rear Rzeppa joint every 8,000 miles. I drive 1000 per week so it's pretty frequent.

It is at the dealership now and should be done later this week. They had to order the factory springs. I hope it'll last longer this time (the transfer case CV boot).

 

[Tazzieman]

Crown already makes the same CV for under $100.

Crown Automotive 68272524FRK Crown Automotive CV Joint Repair Kits | Summit Racing

Free Shipping - Crown Automotive CV Joint Repair Kits with qualifying orders of $109. Shop CV Joints at Summit Racing.

www.summitracing.com

How does that one differ from the Rzeppa one they also list ($184)?

 

[ADVAW8S]

@Zimm. Mentioned a split boot as a solution so I hit Google and saw solutions as a band aids. They mentioned they will work on Jeeps so I figured might work on Ineos.

ProSeries CV Savers

Find your size- measure the diameter of the large side of the existing CV Boot. ATV/UTV – large end opening range is 2.5 to 3.5 inches fitting most quads and utility vehicles under 900cc. SXS – large end opening range is 2.5 to 4 inches fitting most Polaris, Textron, Honda, Yamaha and Can Am...

sealsavers.com

 

[parb]

How does that one differ from the Rzeppa one they also list ($184)?

its exactly what i tried to figure out. is it just the boot or the entire joint? looked like the joint. So is crown just a cheaper version of rzeppa?

 

[DenisM]

its exactly what i tried to figure out. is it just the boot or the entire joint? looked like the joint. So is crown just a cheaper version of rzeppa?

While occasional failures seem to have been recorded in most markets, the leading indicator seems to be a failed boot. One early case in Australia included a failed retention circlip. Failed boot->loss of lubricant->mechanical failure appeared to me to be the sequence...
I also wonder about driving styles:
There appears to be a higher occurrence (larger market?) in the USA
I regularly see reports by US forum members reporting cruising speeds of 75mph to 85mph or higher.
For standard 265/70/17 wheel tyre combination at 100kmh = 62 mph the wheels are rotating at approx 660rpm which with a 4.1:1 diff ratio equates to a prop shaft speed of 2700rpm
A cruising speed of 75mph increases this shaft rotation speed to 3250rpm while 85mph increases it further to approx 3700rpm.
There is an enormous deformation/torsional flex on the tight elastomer cv boot as is, due to its alignment. Increasing these stresses by a 1000rpm increase in shaft rotation at 85mph vs 62 mph surely must generate additionally significant heat and fatigue loads on the boot leading to the point of failure. This is exacerbating the existing increased stress loads induced by shaft alignment issues in vehicles with 2" suspension lifts.. where failure rates seem higher.
So.... alignment and shaft rotational speed.
Thoughts?

 

[Dokatd]

While occasional failures seem to have been recorded in most markets, the leading indicator seems to be a failed boot. One early case in Australia included a failed retention circlip. Failed boot->loss of lubricant->mechanical failure appeared to me to be the sequence...
I also wonder about driving styles:
There appears to be a higher occurrence (larger market?) in the USA
I regularly see reports by US forum members reporting cruising speeds of 75mph to 85mph or higher.
For standard 265/70/17 wheel tyre combination at 100kmh = 62 mph the wheels are rotating at approx 660rpm which with a 4.1:1 diff ratio equates to a prop shaft speed of 2700rpm
A cruising speed of 75mph increases this shaft rotation speed to 3250rpm while 85mph increases it further to approx 3700rpm.
There is an enormous deformation/torsional flex on the tight elastomer cv boot as is, due to its alignment. Increasing these stresses by a 1000rpm increase in shaft rotation at 85mph vs 62 mph surely must generate additionally significant heat and fatigue loads on the boot leading to the point of failure. This is exacerbating the existing increased stress loads induced by shaft alignment issues in vehicles with 2" suspension lifts.. where failure rates seem higher.
So.... alignment and shaft rotational speed.
Thoughts?

Without checking your math you are 100% correct. The only part you are missing is the frequency of boot pinch based on lift height if any, terrain outside of highway or if towing heavy tongue loads. The boot pinch ultimately is the core problem on stock or lifted trucks. The shaft RPMs are the final nail.

 

[DenisM]

Without checking your math you are 100% correct. The only part you are missing is the frequency of boot pinch based on lift height if any, terrain outside of highway or if towing heavy tongue loads. The boot pinch ultimately is the core problem on stock or lifted trucks. The shaft RPMs are the final nail.

Thank you for the clarification, you are spot on..." boot pinch" is a far more precise description and is what I had in mind when referring to "deformation /torsional flex"

 

[Tazzieman]

I wonder how many failures have occurred in Europe , where 90-100 mph is often just the middle lane of the autoroute.

 

[Dokatd]

I wonder how many failures have occurred in Europe , where 90-100 mph is often just the middle lane of the autoroute.

I'm a bit ignorant, but isn't that only a few areas. And there are restrictions on trucks right? Again I plead serious ignorance here.

 

[Tazzieman]

I'm a bit ignorant, but isn't that only a few areas. And there are restrictions on trucks right? Again I plead serious ignorance here.

The Grenadier wouldn't be classed as a
"truck" in that it doesn't weigh over 3.5T.