If you do not disable overdrive on a heavy trailer, the transmission will
continuously hunt for the overdrive. Disabling it prevents this and will
save your fuel pump and transmission.
I don't see why you would need to disable in 4x4, unless you are pulling
some mean rpms with a heavy load.
shouldn't be high enough to shift into overdrive anyways. and personally if
you ask me, unless your on a farm having to service equipment in a muddy
field 4wd is a not need. if the road conditions are so bad that I cant get
there with my 2wd then I don't need to get there at that moment IMHO.
I drive 25 miles to work, sometimes the highway is covered with snow. I get
much better traction using 4 wheel drive. I can usually drive around 40 mph.
I'm not sure at what speed the overdrive starts working.
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