Markings on differential from e28

[brahbarian]

http://imgur.com/wgg6GWc

It's a lsd from a 535. I assume and Chances are it's a 3.25. There's no metal tag on it. Was wondering when I count the teeth inside, what would be the number conversion to tell what differential it is?
Also what is the white "e" and "s" stamps mean?

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[LJ851]

Since it's a LSD, both output shafts will turn together when you spin the input shaft. Put a paint mark on an out flange and on the input flange and rotate the input flange until the outputs have rotated exactly one revolution. However many rotations the input made (you were counting, right?) is your ratio.

For example, you spin the input 3.25 revolutions to rotate the outputs once, your ratio is 3.25.

If the car was an autotragic IS it could be a 3.45 which is nice.

[brahbarian]

Oh snap! It was a auto!
I'll go do this when I swap it in. And do my drives haft.
I'll report back.

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