mmaaxx the Triton is chain driven and all the Mitsu's are (even the very 1st L200's were), but the transfer gear set is in the extension/selector housing behind the gearbox so it's just a matter of swapping out the low gears for the crawler gears
I can't see why you couldn't do the same in the lux so maybe a bit of research could be worthwhile or just trade the Lux for a Triton