I measured between center of drive shaft and bottom of engine, I will have to cut out base plate that hold engine and drop motor 1 inch to line up with drive shaft to hydro motors. Driveshaft to short for universal joints. We have a big tractor swap meet here at Portland IN on the 15 of may will go and see what I can find for a new motor on this grass hopper, it will be at least 20hp. I here good things about briggs motors, but I can,t find parts for them.I have two koaler 20 hp motors but I would have to much work to fit them on the grasshopper.I want the grasshopper mower for the vac system, 3acres 50 trees and I hate to rake. Like most people I have learned that getting old is not for sissys and I need all the help I can get. Thanks for your help. poky