Need help on the final drive ratio of M10 engine

[wilnet]

I have owned a 1986 E30 with M10 engine 1800 cc flue injection, five speed manual transmission. I am thinking about changing to the automatic transmission with the same engine. My question are:

1) What is the current final drive ratio of the five speed manual transmission?
2) What will be the final drive ratio if I change to the automatic transmission?

[johnl320]

My M10 auto has a 3.91 ratio.
I think the manual would have a 4.10

hope this helps

john