OTA checked out the Bus4x4 range of mine transportation vehicles.

Bus4x4 is a Brisbane-based secondary manufacturer of 4WD and 6WD mine transport vehicles. The company's principal product lines are Toyota HiAce and Coaster 2WD buses that are professionally converted to 4WD. OTA checked out the current range and tested the Coaster and HLT projects. 

Bus4x4 has cut its teeth - literally - in the Australian mining environment and we can't think of a tougher place to learn what works and what doesn't. Drivers of mining company equipment aren't exactly noted for their loving care of machinery!

Bus4x4 converts new or used Toyota Coasters from two-wheel drive (2WD) to all-wheel drive (AWD), using in-house designed technology with genuine Toyota parts. 

The 4x4 conversion work is currently done in Brisbane, but there are a number of approved service centres in other parts of Australia. The conversions suit both manual and automatic versions of these vehicles.

The transition from a 2WD Coaster to an AWD bus starts by adding a lift-kit to the front and rear suspension. Next, another Toyota differential is added up front, which gets its drive from an AWD transfer case. With this system there is no need to engage free-wheeling hubs for off road driving.

The standard ventilated disc brakes from the Coaster are changed for an updated type, to accommodate the front drive axles. Calipers and disc pads remain as standard.

The front prop-shaft connects to a LandCruiser 200 Series AWD, two-speed transfer case that's stirred by an electronic rocker switch.

At the back the drive axle is slung under the leaf-spring pack and with optional super-single tyres the ground clearance is increased to a whopping 230 mm. Also on offer is a High Lift 2WD Coaster that can be converted to a high ground clearance bus an the  4WD kits can be added later.

We inspected a Bus4x4 Coaster in build at the company's Brisbane factory and were most impressed with the design and quality of the kit.

The dimensions have been worked out so that the new front hub carrier picks up the existing upper wishbone mounts and the front diff bolts to the standard lower suspension mounts. The front diff cradle carries the lower control arm and leading arm mounts, so the standard suspension parts are retained, but with a taller hub carrier, to increase ground clearance and allow room for a custom-built half shaft to connect to the front hub.

Also impressive is the  use of standard propshafts and jack shaft. The remotely-mounted LandCruiser 200 Series transfer case is positioned so that the standard rear shaft and jack shaft become the front drive link and a standard rear propshaft - minus the jack shaft - becomes the rear drive shaft.

The whole concept is aimed at using as many standard Toyota parts as possible.

Price for a bus-configured Standard 4WD Coaster is $159,990 + GST; price for Deluxe 4WD Coaster is $162,990 + GST and the price for a 4WD Conversion Kit for an existing Coaster is $49,990 + GST. 

We took a 2017 Bus4x4 Coaster for a brief on-road drive and were most impressed with its 'factory feel'. Steering, ride and handling felt no different from standard 2WD Coaster behaviour, despite the higher stance of the modified vehicle. The Bus4x4 Coaster is fitted with full-time 4WD and the dial control for 4WD with centre diff locked and for low range engagement is straight from the LandCruiser  200 Series.

Previous models

Previous Coasters were converted to 4WD using a live front axle on leaf springs Bus4x4 had import rights over the higher-output Coaster models that Toyota didn't import.

The standard issue engine was a Hino four-litre with 110kW, but Bus4x4 could give you up to 135kW. A manual five-speed and a five-speed auto were available.

Out came the standard front end and in went a purpose-designed live axle with Dana 70 or 80 centre, manual free-wheeling hubs and ventilated disc brakes. The chassis was modified to accept long-travel coil spring front suspension.

A front propshaft connected to a New Process, two-speed transfer case that was stirred by a shift lever at present, but was replaced by an electronic rocker switch in later models.

At the back the drive axle was slung under the leaf-spring pack, increasing ground clearance by a whopping 250mm. An optional Eaton TrueTrac diff centre could be fitted, as could final drive ratios from 4.9:1 to 6.1:1. 

Bus4x4's HiAce

The Bus4x4 Commuter is based on a HiAce 2WD mini-bus that has seating capacity for 12 or 14. Vehicles with five-speed manual or four-speed auto boxes can be sourced.

The procress of converting it to 4WD is similar to that employed for the Coaster, but the drivetrain is designed to match 100kW/300Nm, three-litre diesel outputs.

This is done with a Toyota Prado dual-range transfer case, giving All-Wheel Drive and electric operation of low range control.

Bus4x4 increases the suspension an additional 30mm from the previous model, giving the Commuter an overall 110mm lift. Front suspension is independent, with torsion bars and the rear end having the axle under-slung to give increased belly clearance.

A long range 110 litre fuel tank is part of the package. Wheels and tyres are standard 16-inch or optional 17-inch. A number of patterns are available for different applications. Typical tyre size is 235/75R16. 

The 4x4 Hiace Commuters are available in both manual or automatic versions, and are very similar in feel to the original 4x2 versions.

Will it replace the LandCruiser Troop Carrier? We think that it’s certainly a lower-cost, more ergonomically acceptable people carrier or ambulance platform than a modified Troopy, but replacing the reliable and popular Troopy is not an easy task.

Bus4x4 has converted a combined total of 400 vehicles to four-wheel drive and supplies to major mining companies and mining contractors across Australia. The company exports as well and has supplied Coaster 4x4 kits to the Middle East, Latin America and the Dominican Republic.  

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