I have never disabled mine except when I am towing. I have towed for years.
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.
you would be exactly right. the speeds in conditions bad enough for 4wd
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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