flipper,

You've got the right idea.  Over drive doesn't need to be on
all the time.  You do need to turn it off going up/down hills.
 I have a friend that blew a trany for not turning it off
going up/down hills.  His van was only several years new when
it happened.  We tow a 23' Parker fully loaded with dive gear,
fishing gear, and several ice chests full of ice.  After that
incident and turning off the over drive going up/down hills,
he has not had any problems with his van.

Hope this helps.

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AMP2564