GWM Tank 300 Bash Plate & Underbody Protection: 7 Weak Points (2026)

A single rock strike to your Tank 300's fuel tank mounting bracket can punch a hole in seconds — and you're looking at roughly AU$1,800–2,400 plus a tow out of wherever you are. The factory "bash plate" is really just a splash guard, so the transmission, transfer case and fuel tank are hanging out in the open.

Off-road underbody damage isn't cosmetic. It's the difference between a few hundred dollars of protection and a multi-thousand-dollar repair that strands you a long way from the nearest town. Here's where the Tank 300 is most exposed underneath, and how to protect those seven points before your first proper trip.

Why the Tank 300 Is Exposed Underneath

The Tank 300 is a genuinely capable 4x4, but its underbody has some real vulnerabilities. The first is ground clearance: GWM Australia lists it at 224mm unladen.

That's fine for graded dirt and moderate trails, but it sits below some rivals — the Jeep Wrangler and a few others ride higher — so on rocky ground there's less margin before you're scraping belly. The verified figures are a 33° approach angle, a 34° departure angle, and a 23.1° breakover angle.

Suspension geometry matters too. The Tank 300 runs a double-wishbone independent front end, which is great for on-road comfort but hangs the lower control arms and mounting points down lower than a solid front axle would. Those become the first things a rock finds.

The Breakover Problem and Factory Protection Gaps

The approach and departure angles are respectable, but the 23.1° breakover is where the Tank 300 is caught out. Breakover is set by wheelbase and clearance, and it decides the sharpest crest you can drive over before the belly grounds out — which is exactly where damage happens.

It doesn't help that the factory "skid plate" is closer to a splash guard. It shields the front of the engine area but stops well short of the transmission, transfer case and fuel tank, leaving most of the drivetrain underneath exposed to direct hits.

That's why a proper bash plate set isn't really an accessory on this vehicle — it's close to essential for anything past a formed dirt road. Without it, driver skill is the only thing standing between a rock and thousands of dollars of running gear.

The 7 High-Risk Underbody Zones (Ranked by Repair Cost)

Knowing what's at risk helps you prioritise. Here are the seven most vulnerable zones, ranked by what they typically cost to fix (figures are indicative AU$ estimates — actual quotes vary by workshop and location).

1. Fuel Tank & Mounting Brackets — AU$1,800–2,400

The tank is large and barely protected, and the real weak point is the mounting brackets. A direct hit can bend a bracket, stress the tank and lead to a puncture. A fuel leak on the trail is about the most dangerous and expensive thing that can happen out there.

2. Transmission Pan & Cooler Lines — AU$1,200–1,800

The auto transmission pan is thin stamped metal. A sharp rock can punch through it, dumping fluid and leaving you stranded. The nearby cooler lines are just as easy to crush or shear off.

3. Front Differential Housing — AU$900–1,400

The front diff is one of the lowest points on the vehicle. The housing is tough, but a hard enough impact can crack it or wreck the cover, draining the gear oil — and if you keep driving, the internals let go.

4. Transfer Case Lower Section — AU$800–1,200

Sitting right behind the transmission, the transfer case is another low, critical target. Its actuator motor and housing hang down, and a hit here can knock out your 4WD or open a major fluid leak.

5. Exhaust Mid-Pipe & Catalytic Converter — AU$400–700

The exhaust is meant to take knocks, but a hard hit can flatten the pipe and choke the engine. Worse is damage to the catalytic converter or oxygen sensors, which throws engine lights and can fail a roadworthy.

6. Rear Differential Cover — AU$350–600

Like the front, the rear diff sits low and the cover is the weak spot. Peel it back on a rock — a "peeled diff" — and the gear oil drains fast. It's a common failure point on plenty of 4x4s.

7. Steering Rack & Tie Rod Ends — AU$300–500

A bent tie rod instantly ruins your alignment and can make the truck near-impossible to steer straight. It's cheap to fix, but it can still end your trip and need a tow. A full GWM Tank 300 chassis guard plate covers the most critical of these — the transmission and transfer case — in one go.

Real Owner Reports: What Actually Breaks Off-Road

Theory is one thing; what owners actually report is another. The patterns from trips and workshops paint a clear picture of where the Tank 300 struggles once the pavement ends.

One commonly reported issue is a knocking noise from underneath that turns out to be loose undercarriage bolts or tie-rod hardware — sometimes within weeks of delivery. It's a useful reminder: fasteners underneath these trucks can work loose, so checking and re-torquing them is part of ownership, not just trail prep.

That kind of looseness shows up even in on-road use. Take the same vehicle onto a challenging trail, and the odds of a proper failure climb fast.

Rock vs Sand: Different Terrain, Different Dangers

The terrain dictates the damage. Soft sand mostly stresses the cooling system and drivetrain, with little risk of underbody impact — it's a heat and traction game, not a rock game.

Rock crawling is the opposite: a direct assault on the undercarriage. The classic sequence is a loud bang from a strike, then the slow drip of a critical fluid. Depending on what's leaking — transmission fluid, gear oil or coolant — you may have only limited distance before that component overheats or seizes, so stop and inspect the moment you hear a solid hit.

The Cumulative Effect of Minor Hits

Not all damage is dramatic. Plenty of owners just collect scrapes and dents on control arms, cross-members and exhaust pipes. They look cosmetic, but they're stress points.

Repeated impacts fatigue metal and can start cracks. A dented transmission pan might not leak today, but it's weaker and more likely to puncture on the next hit. That's why a post-trip underbody inspection isn't optional for anyone doing serious driving.

Factory Protection vs Aftermarket Bash Plates

Look under the front of your Tank 300 and you'll see a thin metal plate. That's the "factory protection," and it's there to keep road debris off the engine — not to take the vehicle's weight on a rock.

It covers the front engine area and essentially nothing else: no real protection for the transmission pan, transfer case, fuel tank or exhaust. And in most markets, including Australia, GWM doesn't offer a comprehensive OEM bash plate upgrade through dealers, so the aftermarket fills the gap.

A quality bash plate set is built to be part of the vehicle's defence, not a token cover.

Material and Coverage

Aftermarket plates like the 0.3-inch GWM Tank chassis guard are typically 3mm (0.3") or thicker steel. The idea is to slide over obstacles and spread the impact into the chassis rails, instead of letting a single component take the full hit.

A full set runs protection from the front diff back through the transfer case. That's the difference between scraping a replaceable steel plate and cracking an irreplaceable transmission housing.

The Financial Case

The maths is simple. A comprehensive bash plate set is around AU$519. A punctured fuel tank or cracked transmission can easily top AU$2,400 before you add a tow from somewhere remote. Prevent one moderate incident and the armour has paid for itself.

Fitting is a realistic DIY job for most — a few hours with basic tools — whereas trail damage almost always means a workshop, specialised gear and downtime on top of the parts bill.

How Long Does a Bash Plate Last?

A bash plate is a long-term buy, so lifespan and upkeep matter. A good 3mm stainless or powder-coated steel plate is built to last the life of the vehicle with reasonable care.

For coastal or alpine owners, corrosion is the main enemy. Stainless resists it best; powder-coated steel relies on its coating, so if the coat gets deeply scratched, touch it up with rust-inhibiting paint before rust creeps under the finish.

Deformation vs Penetration

A bash plate is meant to get scratched, scraped and dented — a battered plate is one that's done its job. The thing to watch is the difference between cosmetic damage and structural failure.

A dent or gouge usually isn't a problem unless it's pressing up against the component it's meant to protect. Replace a plate when it cracks, or when it's bent so badly it can't be straightened. Actual penetration of 3mm steel is rare.

Maintenance and Inspection

Durability is also about the hardware. The bolts holding the plate to the chassis cop a lot of vibration and load, so check them for tightness after every major trip, or at least every service interval.

A medium-strength thread locker at install helps stop bolts backing out over corrugations — a small step that prevents a lost plate down the track.

Underbody Failure Modes & Warning Signs

Spotting the early signs of underbody trouble can save you from a catastrophic failure on the trail. The warnings are subtle at first, so knowing what to look and listen for is a core off-road skill.

The clearest sign is a fluid leak, and different fluids look and smell different. Red or pink fluid from the middle of the vehicle is usually transmission fluid; dark, thick oil from the front or rear axle points to a diff; a strong petrol smell is an immediate red flag for the fuel tank or a line.

After any trip where you heard impacts, get under the vehicle with a torch and look for wet spots, drips, or fresh clean patches on dusty components where fluid has washed the dirt away.

Audible and Tactile Warnings

Your ears are a great diagnostic tool. A new scraping sound that changes with speed can be a bent dust shield or dragging exhaust. A deep, rhythmic knocking or clunking — especially on turns — can mean a damaged CV joint or a loose suspension or steering component.

Don't ignore new noises; they're the vehicle telling you something's wrong. A sudden change in steering feel, like a pull to one side, is a classic sign of a bent tie rod or other steering-linkage damage.

When a Dent Becomes a Danger

Not every dent is a crisis. A dent in a chassis cross-member is usually cosmetic. But a sharp dent in a driveshaft can unbalance it, causing vibrations that destroy seals and bearings over time.

A dented diff cover that isn't leaking should be watched closely, since the seal may be compromised. A dent in a fuel tank, even without a leak, is a stress point more likely to fail next time. Rule of thumb: if the dent is sharp, creased, or has compromised a seal, get it professionally assessed.

Recovery Gear When the Underbody Is Damaged

Underbody damage often compromises your recovery points. A front-end hit that bends the steering rack can also bend the chassis horns where the factory tow hooks mount, making them unsafe to pull on.

Recovering off a compromised point can rip the hook free and turn it into a projectile — which is why you want more than one solid option. A set of GWM Tank 300/400 Split Off-Road Tow Hooks spreads the load more evenly across the chassis mounts, which helps on an angled pull.

Alternative Recovery Points

If the front is too damaged to recover from safely, your trailer hitch becomes the primary rear point. A quality hitch receiver bolts to the strongest part of the rear chassis and handles straight-line pulling well.

Always use a dedicated hitch recovery shackle mount — never the hitch pin or the tow ball. The ball is made for downward load, not the shear force of a snatch, and can snap.

Choosing Shackles

Shackles are the critical link. Use rated recovery gear matched to your vehicle's weight (the Tank 300's kerb weight is roughly 2,100kg), not hardware-store shackles, so you've got a proper safety margin for the shock loads of a recovery.

Use a soft shackle when joining two straps to avoid a metal projectile if something fails, and carry at least two rated shackles for connecting your strap to the vehicle's recovery points.

Step-by-Step Bash Plate Installation

Fitting a bash plate is one of the most worthwhile DIY jobs you can do on this truck. A few hours and basic tools buy you thousands of dollars of protection.

Before you start, get your gear together: a socket set, a calibrated torque wrench, and heavy-duty jack stands rated well above the vehicle's weight. Never work under a vehicle held up by a jack alone.

Most kits bolt to existing factory-threaded points in the chassis rails and cross-members, so there's usually no drilling — check your specific kit's instructions to confirm.

The Process

1. Prep: park on level ground, engage the park brake, lift the vehicle and secure it on jack stands with room to work.
2. Find the mounts: locate the factory threaded points and clean the threads with a wire brush so the bolts run in smoothly.
3. Position loosely: working front to back, fit each plate but leave the bolts loose so the next plate can be aligned.
4. Torque to spec: once everything's hand-tight, torque the bolts to the figure in your kit's instructions (don't guess) — over-torquing strips threads, under-torquing lets plates rattle loose.

Common Mistakes & Final Checks

Two common slip-ups: forgetting the supplied washers (they spread the load under the bolt head), and fully tightening one plate before the next is aligned. Leave everything loose until all plates are in place.

When you're done, check there's clearance between the plates and everything nearby — especially the exhaust and driveshaft — then lower the vehicle and re-check the bolt torque after a short drive, since things settle. This pairs neatly with other chassis-mounted upgrades like a Tank 300 stainless trailer hitch, which uses similar mounting points.