Review: Isuzu 4WD Truck From All Terrain Warriors, Year 6

Our Isuzu 4WD truck (NPS 75-155) turned six recently. It’s covered lots of outback dirt roads… and more tar than we’d have liked.

We live in it full-time, only travelling back home occasionally when the need arises. Whenever we can, we take dirt roads over tarred roads… not so easy this past year with all the rain about.

Our six-year old Isuzu 4WD truck.
Our Isuzu NPS truck with Wedgetail Camper.

We do a review every year, listing any issues or major modifications. Here’s the links to previous reviews:

Now it’s time for an update… what’s happened in the last 12 months? Has it been reliable and have we had any issues? Let’s find out.

“Where Has the Truck Been in the Last Year?”

We’ve done plenty of dirt roads in the past year. For nearly six months, we meandered around outback Queensland due to Covid border restrictions. However, we did manage to get into South Australia and western NSW as well.

Here’s a summary:

It’s been a busy year!

As seems to be the way with us, many of those trips have been over rough and badly corrugated roads. The odometer is at 185,000km, which means we did 27,000km in the last 12 months.

This averages out to just under 31,000km a year since new.

“Any Breakages?”

Yes, our first major one. While travelling on the rough roads of Rinyirru (Lakefield) National Park, the front left lower shock absorber mounting bracket snapped off.

Bottom front left shock mount broken on an Isuzu 4WD truck. At Rinyirru (Lakefield) National Park, QLD.
This is a sight you’d prefer not to see!

I knew these were a weak point, so I’d been keeping an eye on them. Although not close enough as it turns out. Once the bracket snapped through, it was obvious they’d been cracked for quite a while.

What caused it? Well, the final straw was us hitting several hidden washouts one after the other, while trying to get off the road for on-coming motorbikes.

Broken front left, lower shock mount on an Isuzu NPS 4WD truck.
The bracket had been cracking for a long time. The trouble is, it’s almost impossible to see the crack.

Long term, it would have been an accumulation of lots of driving on rough roads. As I said, it’s a known problem and I should have had them reinforced before they snapped. It’s a crappy design, no doubt.

The rear lower shock mounting brackets are also a known weakness. So keep a close eye on them as well.

I also strongly suspect the Bilstein shocks were too firm on the compression stroke. The Bilsteins were light years better than the original Powerdown shocks, but they were pretty stiff.

The old Bilstein shocks off our Isuzu 4WD truck.
The Bilsteins were battered and bruised, but still working well. Note the hammering from rocks the rear shocks received.

In hindsight I should have taken them back to the Bilstein supplier to soften them up a bit. However, I wasn’t too impressed with their service at the time so didn’t get it done.

One surprising outcome from this little adventure…

I removed the shock, then we drove to Cooktown across some horribly corrugated roads on three shocks. After that, we drove to Cairns via the Bloomfield Track and through the Daintree on tar.

There was absolutely zero change in the truck’s handling… except for a softer ride! No lean in corners, no nasty rebounds on corrugations, no chattering of the front wheel, no nasty feedback through the steering wheel, no change under heavy braking.

Nothing at all, except for a much better quality ride. I could have left it with just one front shock and comfortably driven it forever.

It was after this I decided the Bilstein shocks were way too hard.

By the way. A big thanks to Murray Young in Cairns for pointing me to a fantastic repair shop in Cairns, who did a great job. I’m not sure they want to be inundated with extra work, so I won’t name them here.

King Shocks use large rod ends rather than rubber bushes on their shock absorbers.
The workshop in Cairns welded the brackets back together then added a mild steel gusset on top. They did both sides while they were at it.

“Any Repairs or Replacements?”

We’re had two repairs and one replacement in Year 6. The first obviously, was finding a replacement for the Bilsteins.

New Shock Absorbers

After the front left shock mount failure and the experience of a better ride with only three shocks, I decided to bite the bullet.

A quick call to Brad Zacka at King Shocks and a new set with remote reservoirs were on their way.

Why King Shocks? I know several people who use them successfully in the brutal, car-breaking world of cross-country racing. I’ve never seen one fail and their multiple levels of adjustment mean they can be tuned to the vehicle.

King Shocks with remote reservoirs fitted to the front of our Isuzu 4WD truck.
Our King Shocks with remote reservoirs.

On top of this, the piston rods are huge. King Shocks also use large rod eyes with spacers at each end wherever possible, instead of rubber bushes. And the shocks are fully re-buildable.

Their attention to detail is fantastic. Even down to small but important details like an inner sleeve on the top front bushes. This prevents the bushes being over-squashed and damaged. It’s these details which are critical for long life and reliability.

When you look at the photos, you might be wondering a few things. Like why did I mount the rear shocks with the remote reservoirs facing forwards? Why not flip them 180° so the reservoirs could sit facing the back?

King Shocks with remote reservoirs fitted to the rear of our Isuzu 4WD truck.
The new King Shocks installed on the rear axle. They make the rest of the truck look pretty shabby!

Well, I wanted to keep the rubber boots up high, out of the way of stones. To protect the shocks, I simply fitted a piece of closed cell neoprene rubber held on with giant cable ties and split corrugated tubing to protect the cable ties. This simple setup has worked perfectly.

Cheap yet effective stone guards for the rear King Shocks on our Isuzu 4WD truck.
A piece of closed cell neoprene rubber protects the rear shocks from stone damage.

And why not have rubber boots on the front shocks? Two reasons. Firstly, when I installed the shocks I didn’t fit the boots. The shocks came supplied with protection shields. Secondly, the rods don’t get showered with stones at the front… unlike the rear shocks.

I should fit the front boots – I just need to get around to it.

The difference in ride quality is unbelievable. If I bought another truck, they’d be Item #1 on the list. To be fair to Bilstein, they also made a big difference to ride quality. However, the ride with the King Shocks is next level.

And they hardly get warm, even over long stretches of corrugations. They’re an impressive piece of gear, no doubt about that.

One other surprise replacement was the tie rod ends for the steering arms.

New Tie Rod Ends and a Wheel Alignment

One of our readers Simon mentioned he’d had an issue with front tyres scalloping. He tracked it down to a worn tie rod end.

I keep a good eye on everything around and under the truck, tie rod ends included. But after Simon’s comment I had a closer look at them. A tell-tale smear of grease on two of the four tie rod ends turned out to be split boots. (Thanks for the heads-up Simon).

I was a bit surprised the rubber perished after only 180,000km and six years. But then again, I suppose the truck has been in some pretty harsh environments.

While the tie rod ends were still okay, it was definitely time to replace them. It’s an expensive exercise, mainly because it involves a wheel alignment.

Ballarat Isuzu replaced the tie rod ends then drove it to Sunshine (an outer Melbourne suburb) for a well-overdue wheel alignment. (A free plug for Ballarat Isuzu here. Their service is excellent, highly recommend).

A new tie rod end on our Isuzu 4WD truck.
Four new tie rod ends.

What a difference! It felt like a new truck.

I actually checked the tyre pressures because strangely the ride was so much softer. I suspected they may have let a heap of air out of the tyres to soften the ride. But no, they hadn’t touched the tyre pressures.

For whatever reason, the wheel alignment changed the ride significantly. I can’t explain that one…

It’ll be interesting to see if it also helps with the issue of the front tyres scalloping. Although it might be difficult to tell, because we’ve changed tyre brands.

New Boots

With Toyo Tyres out of the Australian market, I was trying to find a viable 19.5” tyre replacement.

My main concern was having to fork out a pile of cash for the unproven Founders tyres. Plus I wasn’t too excited about going to mud tyres from all-terrains. After discussing this with All Terrain Warriors, they generously offered us a set to trial.

Go here to read our initial impressions of our new Founders tyres.

Like our experience with the King Shocks, the Founders are a step-change in ride quality improvement.

Isuzu NPS truck with new Founders tyres fitted.
Our Isuzu 4WD truck with brand new Founders tyres. It looks a bit like a Tonka toy!

King Shocks and Founders tyres work incredibly well together. Founders are softer than the Toyos, so they’re bouncier. The King Shocks catch this bounce quickly and dampen it out.

The result is a much-improved ride… and light-years ahead of the Toyo/Bilstein combination.

We’ll do a review of the Founders tyres every ten thousand kilometres, to let you know how they’re going. So far, so good. In fact, I can’t imagine going back to a firmer tyre like the Toyo tyres.

“What Have You Added?”

Nothing this year. We’re super-happy with the current setup.

Last year we did big changes to the rear seat area and the storage boxes on the tray, as we detailed here. At the time, it felt like we’d successfully moved some weight off the rear axle onto the front axle.

However, this isn’t the case.

Before the changes, we were running around 2.8T over the front and 3.8T over the rear axle. After a trip over a weighbridge, I was surprised to find the weight distribution hasn’t changed at all.

I must have been imagining things when I thought the ride had improved over the front axle. Oh well…

“What Other Mods Are You Planning To Do?”

I keep dreaming about fitting a suspension seat to the passenger’s side. Maybe one day, maybe not.

“Any Other Problems?”

None at all. Regular services by Isuzu, regular checks by me and that’s it.

“Would You Buy Another 4WD Truck?”

Yes, we’re still extremely happy with our Isuzu 4WD truck. Isuzu’s legendary reliability is proving to be true. We’d buy another one in a heartbeat.

Having said this, the truck’s only done 185,000km. So it’s hardly even run in. But they’ve been hard miles, and mostly loaded.

What’s impressive is the build quality. Being a simple design, there’s not a lot to go wrong… which was one of the main reasons why we chose this truck in the first place.

Since we bought our truck, small 4WD trucks have exploded in popularity. People are realising the benefits of them.

However, it seems some people expect them to drive like a 4WD ute or wagon. They won’t and they never will.

These trucks are built tough, solid, and simple. Their primary market is South-East Asia where they’re flogged hard every day… and expected to survive unscathed.

If you’re thinking of buying one, keep in mind it’s a truck. A small truck, but still a truck. They’re slow, basic and relatively rough.

But they’re also a lot of fun!

Go here for more Reviews on our 4×4 Isuzu NPS truck.

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