I have a NSI re-drive on a Subaru EA81. I purchased it with a plane at an auction. The builder passed away in 2003 and I have no information on the ratio of the gear. The plane is about 1,000 to 1,200 lbs and is designed for 150 mph. Any way of judging the ratio? I have someone interested in purchasing the drive and want to know the ratio. Any information would be appreciated.

Lin