The previous incarnation had full-time 4wd on the 2.7. The 3.5 had
electronically controlled 4wd.
I haven't studied to know whether there was a similar difference between
the 2.7 and 3.3 when the redesign occurred. The presence of the switch
and the default of 4wd off, seems to suggest electronic control.
Keeping 4wd engaged on dry pavement or at high speeds can cause
significant drivetrain wear. Check your owner's manual to see if it
engages automatically when needed, or take it out in the snow/ice and play
around a little to see if the rear wheels start to engage when the front
wheels begin to spin.
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