jniles

The overdrive is meant to be left on except in situations where the tranny needs a little help from you to stay in a lower gear because it is shifting to and from overdrive too much. We encounter times when we must manually shift down due to a head wind (even when not towing) that is not constant or on long grades that are not constant. In mountains we tend to leave ours off to take advantage of the engine brakeing on the down side.