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Front Drive Shaft Update

Wasn’t there some speculation or mention by some YT folks not that long ago IA was possibly revamping the front driveshaft? Perhaps they are redesigning the boots as I tend to agree that appears to be the weakest link less so the Rzeppa joint itself. I guess we watch what components turn up on newer builds and for a part number change.

I'll pick up my MY25 Gren on Tuesday, so we'll see if they addressed it but I doubt it.
 
Picked up my '25 truck today. Looks the same to me.


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Looks exactly the same. Baffles me why they setup the joint angles like that and used Rzeppa joints. It's as if they thought they would be fine with standard U-joints and then changed their mind.
 
I don't know anything about driveshafts,
but what good is it if test it for millions of kilometers?
 
The vehicles they tested were standard height, not raised.
Yep all good having crap angles from factory design
Why would anyone design a dedicated 4wd from the ground up that can’t have a 2 inch lift without breaking drive shafts, pure stupidity is putting it nicely
 
I don't know anything about driveshafts,
but what good is it if test it for millions of kilometers?
The "1.8 million" km was cumulative across a prototype fleet... Many prototypes supposedly travelled less than 50,000 km and were used for extreme climate testing as well as tuning the engine -transmission pairing.
The vehicle has slightly in excess of 10" clearance as stock. Its on road dynamics were tuned for this arrangement.
For the life of me, I've yet to hear a cogent cost/benefit* argument for larger tyres and raised suspension as a "recommendation" on the current very capable stock vehicle .... 🤔
* i.e. when the crap/worth ratio exceeds 0.5, the value proposition fails😉
 
The "1.8 million" km was cumulative across a prototype fleet... Many prototypes supposedly travelled less than 50,000 km and were used for extreme climate testing as well as tuning the engine -transmission pairing.
The vehicle has slightly in excess of 10" clearance as stock. Its on road dynamics were tuned for this arrangement.
For the life of me, I've yet to hear a cogent cost/benefit* argument for larger tyres and raised suspension as a "recommendation" on the current very capable stock vehicle .... 🤔
* i.e. when the crap/worth ratio exceeds 0.5, the value proposition fails😉
Because we want to and it looks outstanding lifted!
 
Because we want to and it looks outstanding lifted!
Stock Gren is just too low for anything but basic Overlanding. The 2" lift really helps with approach, departure and breakover angles. This is very very important for more off-road capability. The larger tires yield larger sidewalls which help in several ways. And here in the US many trails have requirements more or less to run certain tire size. Tire size limits start at 33's then move up to 35's. It's not advisable to go on these trails without the appropriate size tire. This can be heavily enforced by off-road clubs that sponsor bigger events.

For me, anything less than 35" tires and lockers front and rear would be limiting. And the 2" lift is just absolutely a no brainer if you go beyond the fire roads.
 
I'm running 35's on stock suspension and haven't been limited yet but I don't take this rock crawling. Most of the stuff I want to see in the western US is desert.
 
I'm running 35's on stock suspension and haven't been limited yet but I don't take this rock crawling. Most of the stuff I want to see in the western US is desert.
And I'm sure you would likely be fine on 33's. The majority of rock crawling takes place in the western US deserts, but 90% or more of it is unnecessary to get from point A to B. Don't get me wrong, I love the scenery at "Point B" but I also very much enjoy exploring the limits of my vehicles and myself. And that means more ground clearance.

Places like Moab can be super easy (Think Subaru) or super hard depending on the reason you are there.


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Technical extreme rock crawling, yes it’s the wrong vehicle, absolutely it’s fine at standard height for some.
Anyone who owned a 4wd and uses it as a 4wd will not question a need for a small lift.
I have traveled most of Australia and can assure anyone that a small lift is required unless you want to scape the front, middle and back on every second washout and river crossing, especially in the Victorian high country
 
If technical rock crawling is a goal then the Grenadier is the wrong vehicle. Add a Jeep Wrangler to the fleet and run 37" or larger tires. That is the right tool for the job. The Grenadier is optimized for load carrying on moderate tracks not conquering the hardest obstacles.
Dear lord, a Jeep? Not a chance. I'd rather knock around my Grenadier on the rocks. And quite frankly 35's aren't going to do technical rock crawling. 40's have been the gold standard for quite some time now. 35's are so 1990's.
 
Dear lord, a Jeep? Not a chance. I'd rather knock around my Grenadier on the rocks. And quite frankly 35's aren't going to do technical rock crawling. 40's have been the gold standard for quite some time now. 35's are so 1990's.
HA! Love Jeeps or hate them, there is no refuting that they are great in technical terrain. And no 35s are not big enough in the rocks hence why I suggested 37s or larger. Unlike the Grenadier it is easy to lift the Wrangler/Gladiator to accommodate big rubber. The reality is that skinny 35s fit on the Grenadier with no lift and provide more than enough capability to drive any terrain the vehicle is actually fit for. Owners can lift the Grenadier at their own peril to satisfy a vain need for looks, but shit is going to break as has been so readily demonstrated.
 
Dear lord, a Jeep? Not a chance. I'd rather knock around my Grenadier on the rocks. And quite frankly 35's aren't going to do technical rock crawling. 40's have been the gold standard for quite some time now. 35's are so 1990's.
and now I'm seeing more and more 42" tires on Jeeps with 1 ton axles. Different horses for different courses. Personally, I have zero desire to do hardcore rock crawling. I want to go see things that are hard to get to for most people and do it with a reasonable amount of comfort. The Grenadier is good for my use case.

Sure I wouldn't mind picking the front up an inch or two and likely will when we sort out how to not destroy the driveshaft in the process.
 
I thought it would be informative so people who are not Jeep Drivers you see that 2024 Jeep Gladiator also use Rzeppa CV Joints in both drive shafts. The Front drive shaft has U-joint at the Diff and Rzeppa CV joint at he Transfer case. The rear drive shaft has the Rzeppa CV Joint on both end aka transfer case and at the diff. Remember the Terraflex Rzeppa CV is from a Jeep, John @ Agile is who tested these as non-factory replacement. It be good to see what come of his drive shaft. Also be interesting know what happened to Tom Wood's Drive Shafts.

Front Drive Shaft. Rear Drive shaft

2024 Front Jeep.png
2024 Rear Jeep.png

Figures 1 & 2 from Mopar Store
 
I thought it would be informative so people who are not Jeep Drivers you see that 2024 Jeep Gladiator also use Rzeppa CV Joints in both drive shafts. The Front drive shaft has U-joint at the Diff and Rzeppa CV joint at he Transfer case. The rear drive shaft has the Rzeppa CV Joint on both end aka transfer case and at the diff. Remember the Terraflex Rzeppa CV is from a Jeep, John @ Agile is who tested these as non-factory replacement. It be good to see what come of his drive shaft. Also be interesting know what happened to Tom Wood's Drive Shafts.

Front Drive Shaft. Rear Drive shaft

View attachment 7891834View attachment 7891835
Figures 1 & 2 from Mopar Store
In that configuration the Ujoint angle has to be zero or near zero. That cannot be done with the Grenadier.
 
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