BTW, the Trail doesn't even have a center differential.
I'd like to clarify this statement for some folks.
All 4wd vehicles have a transfer case, meaning its a splitter, than sends power to the front and rear drive shafts, allowing power to the front and rear axles, and then wheels/tires. A fixed transfer case requires an equal number of revolutions for the front and rear driveshafts, that presumably feed axles that have the same gear rations in their own differentials. (Axle Diffs may be locked separately.)
A center differential is a device that allows the number of revolutions of the front and rear drive shaft to differ, based on the distance the front and rear wheels are rolling, which would effect the axle rotation, and thus the driveshaft revolutions.
If the front and rear wheels are moving different distances, but the axle diffs are locked, and the transfer case is fixed, an undue amount of stress will be put on the driveshafts, transfer case, and axle gears, which can be very bad!
Many folks ( in other less educated web-wheeling communities

) speak of center diffs and transfer cases as synonymous with each other, when in fact, they are not.
So, if you aren't on a surface that allows your wheels to slip (dirt, snow, ice, K-Y :wow

then keep in 2 wheel drive.
I think I got it about right. Please feel free to correct any typos, as this was real quick before a meeting...