Hi the 404 will be fine use a good synthetic gear oil in the running gear in the old days squadies thrashed the living daylights out of all Unimogs and the 404 suffer from heat build up in the hubs so use a good grade sun and it'll be fine the m180 is a very under stressed engine with little power Mercedes tend to do this for reliability the theory being you can't break it without the muscle enjoy 😀
Moose