gear ration help
 

hello
I'm working on a rear LSD axle to a 1.8 and I want to know the gear ration and need help.
if I spin the outgoing drive shaft (wheel)1 lap, the propshaft rotates about 3.6 lap but it's probably not a 3.6 axel since I have a short first gear. or do I it wrong?
gerbox is a 6 speed
then it's 4030 making on the big gear drive (see picture) could it be a 4.3 diff?
grateful for help
regard peter

Count the number of teeth on the 2 gears. Divide the number of ring gear teeth by the number of pinion gear teeth.