Originally Posted by 
101 Ron
				 
			I did two different drivers courses on these things when they were first introduced.
They were new.
I was at one stage given a tanker and it was filled to 13tonnes and told to drive it from Sydney NSW to Horsham Vic via back roads.
They used tankers for drive training as it was easy to load them up with a test load.
They were not legal on road as a tanker to there max of 15 tonnes.
5 speed triple shaft main box constant mesh.
They were geared to do 93 kph max, but can do this all day.
Forget the 285 hp rating...........you put these things into top gear and no matter what the load the motor just pulls it as the tip turbine and turbo does it thing.( torque riser style motor)
I do not remember having to down gear change for hills unless I had to slow up for traffic and corners etc.
The gearbox /motor is excellent.
I never drove the things off road much.
When first taken into service issues were with everything being done by air.
Air throttle, air start etc.
Go though the bush a take out a small nylon air line and you will have a dead truck if you turn it off.
Air throttle required use of hand throttle off road as it was to sensitive.
The rear springs....camel back leafs were too stiff by a long way when first introduced, even when fully loaded.
troops were not allowed to be carried due to spinal complains.
The driver had a air seat.
Just as I was leaving the system the macks were getting air bag rear suspension conversion.
I do not know if all were converted or not.
The cabin was to small for two blokes. guns and personal gear.
I very much liked them.........big simple trucks.