Good question. I've been trying to find a manual since I bought mine. I know the 195D has the same engine and I would be willing to bet the gears are the same.
Do you know how to get a rough estimate? Place in 2wd and jack up the front in the air enough so only 1 wheel is off the ground. Then, you make marks on the wheel and front drive shaft and then spin the wheel one revolution and count the number of times the driveshaft revolvles. Use a grease pencil to make easily visible marks. This will get you close.