You can spin the vdrive 10 rotations either input or output shaft and count the rotations on the other shaft. Then do the math .ie; if 10x around on the top shows 12 1/4 turns on the bottom then that would be 22% overdriven.
Here some pics from last weeks move from Tacoma Washington to lake arrowhead. One day drive up and 2 back. California roads suck. Felt like off-road in Barstow the second I crossed the state line. Lathe is about 8000lb luckily I had a telehandler down the street, they work pretty good to move...