[Al Skierkiewicz]

Tom,
By now you have gotten the feeling that this is generally a bad idea. However, two motors who have a close free speed do not run close to the same speed under load. That being said, two motors running on the same shaft(shafts coupled together) will obviously both turn at the same speed. What likely will develop with your setup is neither motor will be running near efficient speeds and will develop some heat. What you do have to remember that before the transmission, each motor is running very different speeds due to the different gear ratios of each motor. That is why the Globes tend to run on after removing the drive signal. The armature is spinning (and early stages of the planetary gears) but has very little drag to slow it down. It might be a better idea to feed the motors with separate Victors and match the loaded speed of each one in software.