I think you are supposed to disengage when you need extra power (steep climbs/pulling a load up an incline).
Ellandry, if that's what the manual says, then I'd go with it. But, if it's only supposed to be used at 50mph+, it would make more sense for the dash light to show when it's ON rather than when it's OFF (but that's neither here nor there).
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-- Christian
(Formerly) '02 Sedona EX 3.5 V6
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