I took a picture of 1st gen and 2nd gen driveshafts side by side and also cross members. You can visually see how smaller the 2nd gen driveshaft is right away. Mark told me the difference in tower locations. The 2nd gen seems to have about a 12” space in the middle before towers start. A first gen has about 9”. Last picture is me just using the measuring tape As a straight edge to show the distance of the motor mount to the measuring tape when I centered it on the frame mounting hole. It shows first gen motor mount base to be further away Forward while 2nd gen was closer to measuring tape (to where frame mount holes are located). I can use a real straight edge and make actual measurements of the difference for record keeping.