Here is another video. Stock 1935 Auburn Speedster, straight 8, supercharged, 2 speed rear is in high, RPMs are at 2k and speed is around 60mph. You can see the tech just to the left of the Speedo. I have been up on the highway a few times in a 35-36 Auburn and the dual ratio rear end makes a big difference. The 810/812 Cord is another good prewar highway car with the 4th gear. I understand E.L. really pushed for the 4th gear because of the experience with the L29 but the case was a bit small resulting in slightly undersized gears and potential transmission issues.