SAE?

[luky]

hi!!
i've got an external spline with 36 teeth, internal diam 38.75mm (1.52 inches)and external diam 41.65mm (1.64 inches) pressure angle 45 degree and Sndp 1.675mm.
someone can help me to define which is the correct standard?
if it would be a SAE standard could you send to me some information about the chart?
this spline is mounted in a opel gearbox
thank you very much

 

[obrist]

I understand it's an external gear 36 teeth, if its so then it's metric module 1
m=ext diam/(nºteeth+2)