Ford rearend question

I have this rearend sitting around. I think I got it out of a cougar. I don't remember. How do I tell if it is an 8 or a 9 inch?

 

As far as the housing goes, I believe those two dimples in the back indicate 8". If you can get a socket wrench on the lower bolts on the front housing it is 8", if not it is 9".

 

That's a 9".

 

http://www.kevinstang.com/Ninecase.htm

 

That being a coil springed Cougar rear end it would be a nine inch.

 

I see the tag in your photo ...

Go here ...

http://www.fordification.com/rearends-ford.htm



If you can get a socket on these two nuts ... it is a 8 inch.

 

To bad it didnt have a great big N on it - those are the good ones - The N means its a nodular iron case and they are super tough

 

Nope this bolts can not be reached. The housing is in the way. I guess it's a nine?

 

Don't sound so down hearted, you got the good one