For differentials: steel — it slides over rocks where aluminum grabs. For broad underbody panels (engine, transmission, fuel tank): aluminum 6mm+ is adequate and saves weight. Buy order: engine/transmission skid first → diff guards → transfer case → fuel tank. One rock to an unprotected transmission pan costs more than a complete skid system.
The INEOS Grenadier has one of the most capable drivetrains of any vehicle you can buy today — beam axles front and rear, permanent four-wheel drive, a locking centre diff, and optional e-lockers. It's the kind of running gear that invites you to push into terrain most modern SUVs would never attempt. But there's a problem nobody at the dealership mentions: the underside of the Grenadier is remarkably exposed.
The transmission oil pan sits low and unprotected. The front and rear differentials hang below the axle tubes. The fuel tank and transfer case are one unlucky rock strike away from a very expensive afternoon. INEOS ships the Grenadier with a basic front skid plate on certain trims, but it covers a fraction of what's actually vulnerable underneath.
If you're planning to take your Grenadier anywhere more demanding than a graded dirt road, aftermarket underbody protection isn't optional — it's the first modification you should make. And in the last two years, the market has exploded with options from companies like MetalCloak, Rival, SPP Overland, Owl Outdoor, and Agile Offroad. The question isn't whether to buy skid plates. It's which ones, in what material, and in what order.
Why the Grenadier Needs Aftermarket Skid Plates
The Grenadier's solid beam axles are a massive advantage for off-road durability — they don't have the exposed CV joints and boots that independent suspension vehicles destroy on rocks. But beam axles do hang the differential housings below the lowest point of the axle tube, making them the first thing to contact obstacles during crawling or crossing uneven terrain.
The more concerning vulnerability is the transmission. Multiple owners have noted how exposed the transmission pan is once you actually crawl under the vehicle.
I will echo the comment about being under the truck doing the diffs and seeing the really exposed transmission pan. I'm probably going to get at least the transmission pan soon.
— r/ineosgrenadier, June 2025
The Grenadier's underbody has six distinct zones that need protection, listed here in order of vulnerability and expense to repair:
- Engine / oil pan — One solid rock strike here and you're done for the day. The oil pan is aluminum and cracks before it bends.
- Transmission pan — Sits low, directly in the path of obstacles. The single most expensive component to damage.
- Transfer case — Less exposed than the transmission, but still vulnerable on crawling terrain.
- Front differential — Hangs below the front axle tube. Takes impacts during approach angle miscalculations.
- Rear differential — Same exposure issue as the front, compounded by departure angle rocks.
- Fuel tank — A punctured fuel tank in the backcountry isn't just expensive — it's dangerous.
Most experienced owners recommend protecting the engine/transmission area first, then the differentials, then the fuel tank. If budget forces you to stage the purchase, a transmission and engine skid plate alone covers the two most expensive-to-repair components on the vehicle.
The Steel vs Aluminum Debate — And Why It Actually Matters
This is the single most contentious discussion in the Grenadier skid plate community, and it comes down to a genuine engineering trade-off: weight versus impact resistance.
Steel skid plates (offered by MetalCloak, Owl for diff plates, and some Rival products) are heavier but significantly harder. They resist deformation under impact, and critically, they slide over rocks rather than grabbing. This matters more than most people think.
Over the decades I have run both Aluminum and Steel Skid plates. Aluminum tends to "stick" more on rocks as it is more malleable. I "prefer" steel as it tends to "slide" more over rocks and it does not deform as much if you really land hard on it.
— ColoradoMike, TheIneosForum.com
Aluminum skid plates (offered by SPP Overland, Rival, Agile Offroad, and Almont) are lighter — sometimes dramatically so — but have less than half the tensile strength of steel at common alloy grades. Most manufacturers use 5052 or 6061 aluminum, not the aerospace-grade 7075 that some buyers assume.
You're not getting 7075-T6 on anything sold. Agile Offroad puts theirs as 5052 which is about half the tensile strength of a typical steel piece.
— Zimm, TheIneosForum.com
Owl Outdoor actually documented this in their own product development. During prototype testing of aluminum differential skid plates, they found the results unacceptable and switched to steel for those specific components. Their main underbody plates remain aluminum but offer an optional UHMW (Ultra-High Molecular Weight Polyethylene) outer layer for added impact resistance and slide characteristics.
The practical takeaway: for differential covers that take direct point-loading impacts, steel is the better choice. For broad underbody panels covering the engine, transmission, and fuel tank — where impacts are more distributed — aluminum's weight savings make sense, especially with adequate thickness (6mm+).
| Factor | Steel | Aluminum |
|---|---|---|
| Weight (full system) | 80–120 lbs | 30–55 lbs |
| Impact resistance | Excellent — resists deformation | Good with 6mm+ thickness |
| Rock sliding | Slides well | Can grab / stick on rocks |
| Corrosion | Needs coating (zinc, powder coat) | Naturally resistant |
| Repairability | Can be straightened | May crack under severe deformation |
| Cost (full system) | $1,200–$1,500 | $600–$2,500 |
Every Major Grenadier Skid Plate System Compared
The aftermarket has responded aggressively to the Grenadier's underbody protection gap. Here's what's actually available as of 2026, with real owner feedback where it exists.
MetalCloak UnderCloak Integrated Armor System
Material: 1/4" and 3/16" laser-cut steel, gold zinc chromate coated
Coverage: Engine, oil pan, transmission, transfer case, gas tank (full system)
Price: ~$1,439 for the complete system
Made in: USA
MetalCloak's system is the heaviest option on this list and also the most robust. The entire system uses CNC-formed, laser-cut plate steel — 1/4" for the motor and oil pan skids, 3/16" for the transmission, transfer case, and gas tank. Every exposed mounting point uses "skid guard washers" to prevent bolt heads from catching on rocks.
The gold zinc chromate coating isn't cosmetic — it forms a molecular bond with the steel that resists corrosion even after the surface gets scraped. The oil pan skid is tucked as high as possible for maximum approach clearance, and the gas tank skid features upturned edges so obstacles slide underneath rather than catching.
MetalCloak also sells separate differential skid plates and a bracket reinforcement kit for the OEM rear bash plate. One Reddit owner documented the diff plate install:
Made of 3/16" steel with zinc coating and bent into its final shape — a lot less welds this way. Install was extremely easy once I tapped and chased the rusty bosses that the plates bolt into.
— r/ineosgrenadier, July 2025
Best for: Owners who prioritize maximum protection over weight, and plan to do serious rock crawling or remote overlanding where a single impact failure could strand them.
Owl Outdoor Skid Plate System
Material: Aluminum (main plates) + steel (differential plates) + optional UHMW overlay
Coverage: Full underbody + differentials + optional replacement frame cross-brace
Price: Varies by configuration
Made in: USA (Carlsbad, CA)
Owl takes a hybrid approach that's arguably the most engineered solution on the market. The main underbody plates are aluminum for weight savings, but the differential skid plates are steel — because Owl's own testing showed aluminum couldn't survive direct impacts at the diff location. Their product page is refreshingly honest about this, showing a photo of their failed aluminum prototype.
The optional UHMW (Ultra-High Molecular Weight Polyethylene) outer layer is a unique feature. UHMW is the same material used in industrial conveyor linings and marine dock fenders — it's extremely abrasion-resistant and slippery, which means rocks slide across the surface rather than grabbing. This addresses the primary weakness of aluminum skid plates without adding the weight of steel.
One owner reported back after a week of hard trail use:
I have Owl's skid plates and love them so far. Just got back from a week of off-roading in and around Salida/Buena Vista/Leadville and the skids did their job wonderfully!
— TheIneosForum.com, 2025
Best for: Owners who want the best engineering compromise between weight, strength, and slide characteristics. The UHMW option is unique in this market.
Rival 4x4 Underbody Armor
Material: 6mm aluminum
Coverage: Engine, gearbox, transfer case, fuel pump/filter (various packages)
Price: Moderate — individual pieces or bundled sets
Made in: Russia/Europe (available through global distributors)
Rival has become one of the most popular options in the Grenadier community, partly because they were early to market and partly because the price point is accessible. The 6mm aluminum construction provides reasonable protection at substantially less weight than steel alternatives.
The Rival ecosystem is modular — you can buy individual pieces for the engine, transmission, transfer case, and differentials, or purchase bundled packages. They've also been expanding coverage, with gas tank and lower control arm guards in development.
I have a mix of Agile Offroad and Rival plates. The parts from Agile seem a bit nicer designed but they both seem to do the job.
— parb, TheIneosForum.com (Silicon Valley, CA)
Installation on Rival plates is straightforward — most owners report doing it in a driveway with ramps. One forum regular noted you may need to tap and chase some of the factory mounting bosses, which can corrode over time.
Best for: Budget-conscious owners who want decent coverage without breaking the bank. Good modular approach for staged purchasing.
SPP Overland Full Protection Bundle
Material: Aluminum (sanded, black powder coat, or silver powder coat)
Coverage: Engine, transmission, front/rear differential, subframe, gas tank, trailing arm
Price: Premium (full bundle is the most comprehensive — and most expensive — aluminum option)
Made in: UK
SPP Overland offers the most comprehensive aluminum coverage package available for the Grenadier. Their full bundle protects essentially every vulnerable component underneath the vehicle, including trailing arms — a zone most competitors don't address.
The trade-off is price. SPP's full bundle is significantly more expensive than competitors, which multiple owners have noted:
I'm currently seeing the SPP kit which looks great but it is a bit spendy.
— BQAC, TheIneosForum.com (Simi Valley, CA)
That said, Owl Outdoor's founder actually ordered the full SPP set for his own Grenadier before developing Owl's system, which speaks to the quality reputation:
I bit the bullet and ordered a full set of SPP from RRE and my buddy Tim at Adrenaline HQ will install when I'm out there in a few weeks.
— Owl (Owl Outdoor), TheIneosForum.com
SPP products are distributed in the US primarily through RRE Global.
Best for: Owners who want the most complete aluminum coverage possible and are willing to pay for a premium UK-engineered product.
Agile Offroad
Material: Aluminum
Coverage: Front and rear skid plates, with additional pieces available
Price: Mid-range
Made in: Europe
Agile Offroad has a reputation for clean design and good fitment. Their plates are available through multiple distributors globally, including Expedition HQ in Australia. Owners who've compared Agile to Rival side-by-side generally report that Agile's design and finish quality is slightly superior, though both use similar aluminum alloy grades.
Best for: Owners who value fit and finish and want aluminum protection with a slightly more refined design than Rival.
Almont 4WD
Material: Aluminum
Coverage: Multiple individual pieces (engine, transmission, transfer, fuel tank, differentials)
Price: Mid-range
Made in: Spain
Almont is a well-established European manufacturer with a strong reputation in the Land Rover and Toyota communities. Their Grenadier line is comprehensive, with individual pieces that can be purchased separately. One owner with prior Almont experience on a Land Rover noted the quality carries over to the Grenadier products.
Best for: Owners with prior Almont experience from other vehicles, or those who prefer a European manufacturer with a deep off-road vehicle catalogue.
Full System Comparison Table
| Manufacturer | Material | Coverage | Price Range | Origin |
|---|---|---|---|---|
| MetalCloak | 1/4" & 3/16" steel (zinc) | Engine, trans, t-case, fuel tank | ~$1,439 | USA |
| Owl Outdoor | Aluminum + steel diffs + UHMW opt. | Full underbody + diffs + x-brace | $800–$1,800+ | USA |
| Rival 4x4 | 6mm aluminum | Engine, gearbox, t-case, diffs | $400–$1,200 | Russia/EU |
| SPP Overland | Aluminum (powder coat) | Full underbody + trailing arms | $1,500–$2,500+ | UK |
| Agile Offroad | Aluminum | Front, rear, additional pieces | $500–$1,200 | Europe |
| Almont 4WD | Aluminum | Engine, trans, t-case, fuel, diffs | $500–$1,400 | Spain |
Installation: What to Expect
Most Grenadier skid plate systems are designed for bolt-on installation using existing factory mounting points. Here's what the community has learned about the process:
- You'll need ramps at minimum. A lift makes life easier, but most aluminum systems are light enough to install on ramps. Steel systems like MetalCloak benefit from a motorcycle jack to hold the plate in position while you thread bolts.
- Chase your threads first. Multiple owners report that the factory threaded bosses on the Grenadier's frame can corrode, especially in areas exposed to road salt. A thread tap and chase set before installation prevents frustration and cross-threading.
- Anti-seize on everything. You'll need to remove these plates for oil changes, transmission service, and differential maintenance. Use anti-seize compound on every bolt so future you doesn't curse present you.
- Budget 2–4 hours for a full system. Individual pieces like diff guards take 20–30 minutes. A full underbody system with 5+ plates takes a full afternoon on ramps.
Confirm that your chosen skid plate system includes oil filter access before purchasing. MetalCloak integrates a cutout in their oil pan skid for filter access. Some systems require full plate removal for routine service — which means doing it more often than you'd like becomes a deterrent to proper maintenance intervals.
The Buy Order: How to Stage Your Purchase
Not everyone can drop $1,500+ on a full skid plate system at once. Here's the recommended staging order based on component vulnerability and replacement cost:
Recommended purchase sequence
- Stage 1: Engine + transmission skid plate. This protects the two most expensive and most exposed components. If you only buy one thing, buy this. ($300–$600)
- Stage 2: Differential guards (front and rear). The diffs hang low and take direct hits. Steel is recommended here regardless of what material you choose for the main plates. ($200–$400)
- Stage 3: Transfer case skid. Less exposed than the engine and trans, but still important for serious off-road use. ($150–$300)
- Stage 4: Fuel tank guard. Critical for remote overlanding where a fuel leak isn't just expensive — it's a survival situation. ($200–$400)
- Stage 5: Trailing arms, control arm guards, supplementary pieces. These are the finishing touches for a fully armoured underside. Only SPP and a few others offer these. ($200–$500)
As one of the most experienced forum contributors put it when asked what the "best" skid plate system is:
Best is not the criteria to consider, but what works for you depending on your vehicle usage.
— TheDocAUS, TheIneosForum.com
That's the right framing. A Grenadier that sees aggressive rock crawling in Moab needs MetalCloak steel. A Grenadier that does forest service roads and moderate overlanding does perfectly well with Rival or Agile aluminum. A Grenadier that needs the best engineering compromise gets Owl with the UHMW option. There's no single right answer — just the one that matches how you actually use the vehicle.
Complete Your Grenadier Protection Setup
Underbody protection is one piece of the build. For exterior gear mounting — jerry cans, recovery boards, and tools — DVA's Exterior Utility Belt provides L-Track mounting channels along the Grenadier's body panels. Pair with Side Accessory Carriers and Ladder-Mounted Carriers to keep recovery gear organized and accessible. For roof-mounted recovery boards, the DualTrack™ crossbar system accepts standard L-Track recovery board mounts.
What DVA Recommends
At DVA Fabrication, we build accessories from extruded aluminum specifically because the material allows us to optimize strength-to-weight ratios for roof-mounted loads. But we're engineers first, and we'll tell you honestly: for skid plates that take direct rock impacts on differential housings, steel is the superior choice.
For the broad underbody panels protecting the engine and transmission, quality aluminum systems from any of the manufacturers listed above will serve you well. The key is adequate thickness (6mm minimum) and proper edge design — upturned edges that guide obstacles underneath rather than catching on them.
Regardless of which system you choose, underbody protection should be your first aftermarket investment on a Grenadier. Before the roof rack. Before the light bar. Before the lift kit. One rock strike to an unprotected transmission pan will cost more than every skid plate system on this list combined.