The process for taking an accurate measurement is generally the same regardless of the type of vehicle you have. But the end points of your measurements may be slightly different depending on how your driveshaft attaches to the rest of the vehicle. Typically you will end up measureing a driveshaft from one of three stareting points; the center of the u-joint at the transfer case, the face of the flange at the transfer case, and/or the tip of the spline coming from the transmission. You will measure the distance from that starting point to the center of the u-joint or face of the flange on the other end of the driveshaft.