No wheeled vehicle has ever completed the South Arm/West Arm route. There is about a 100m vertical step near Percy Shelter. Have a look at the contour lines on this topo and don't take any notice of what looks like a connected route. Only way to West Arm is by boat unless you walk.

If you get the opportunity its worth doing the tourist trap trip up the lake, down to Manapouri power house and over to Doubtful sound. My last year at Uni of Canty doing Eng. Geology course we got to have a look at all of this and about 500m up the new tunnel from the outlet. That's the sort of stuff that makes little boys want to become Engineers.
P.S. tunnel was about 1/2 constructed at the time!
"The ultimate result of shielding men from the effects of folly is to fill the world with fools." - Herbert Spencer, English Philosopher (1820-1903)
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