if its a long flat stretch, leave OD on, it's fine.

If there are any hills, even fairly minor, take OD off, the extra power is good, and not shifting back and forth will save a lot of wear on your trans.

Have a good drive!

"Does this part need to be in there?"

1996 Dodge 1500 single cab / short bed, 5.9 4x4; 2" lift (springs not blocks), C.A.I and more mods to come.