L5030, whines in high, in med when going up steep hill, not at all in low.
My L3940: .....snip.....
The most whine is a combo of low RPM, high range & pulling hard.
........snip......4 miles one-way to my property at ~13 mph (high range of course) much of it on pavement & don't remember hearing any whine once it's up to speed (that 13 mph). On its way up to 13 there can be some whine, though, espcially starting from zero.