Folks are arguing that the Grenadier is a pure off-roader, and should not be compared to an IFS SUV. I agree with that. But then it needs to be judged pretty hard - but fairly - as an off-roader because (1) that is its purpose, and it will never drive on-road like an IFS SUV, and (2) its price. This is where things get problematic for people whose off-roading involves rocky trails. The Grenadier is not designed with rocky trails in mind. Its just not. Whether you are looking at tire-size, low-range ratio, and now some of the specs of the undercarriage. But to folks who live in the Rocky Mountains, most off-road driving involves rocky trails. It doesn't mean one is seeking out hard rocky trails to drive, but most trails that take you to the higher summer trailheads are super-rocky and steep.
This video is good - seems like one of the most thorough looks at the undercarriage.
Tie rod, track bar, and drag link look stout. Not sure about the rubber boots covering the joints. What kind of joints?
Manual handbrake is fantastic.
Overall, the suspension looks great.
Two pistons driving the front brake calipers, a single piston driving the rear brake calipers. Sub-optimal at the vehicle's weight, and price point.
They say the diff covers are 2 mm thick. My aftermarket axles came with a diff cover that was 9.5 mm thick (that's 4.75 times thicker). A diff cover of 2 mm is not made for rocky trails and will need an aftermarket solution.
The steering stabilizer is below the front axle housing, and has the exact same ground clearance as the front diff. That is going to be a problem and will require an aftermarket solution.
Has Ineos provided specs on the axles? As of a few months ago, you still couldn't get basic specs. In this video, the reviewers show the guy's hand on the axle housing, but as far as I know Ineos has still not released (1) the actual diameter of the axle housing, and (2) the wall-thickness of the axle housing. Good companies tell you both; for example, from Dynatrac:
"Heavy-Duty 3.125-inch Diameter, 0.500-inch Wall Draw-Over-Mandrel (DOM) Axle Tubing" They are also telling you how the steel is made (DOM), which is stronger than the alternative - Hot-Rolled Electric Welded (HREW)
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The nuts and bolt-ends for the rocksliders hang down and are vulnerable to rock strike. Its pretty standard to invert the bolts and recess the bolt head - then you have a smooth surface facing the ground. Same way you need to bolt up skid plates.
The gas tank skid plate will need to be replaced if one faces the possibility of high-centering on rocks (and with 31.6 inch tires, that is likely on a lot of the trails around here). The aft portion of the gas tank is quite low - almost as low as the rear axle housing. That is unfortunate, and unusual in a purpose-built off-roader.
No skid plate protecting the transfer case, which is fairly low.
No skid plate protecting the transmission - and the bottom of the transmission is plastic. One of those two things has to change. The reviewer says as much.
No specs on the drive shafts, but the guy in the video was not impressed with their apparent strength.
The stuff in this photo needs skid-plate coverage:
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