hi how can i tell if my cossie diff is a 7.5 or 7" and the ratio or do i have to take the back off it ?

heres a pic



any help would be good

 

thats a 7.5" diff.

ratio wise,mark the front flange with tip ex or paint etc,mark one driveshaft flange the same,then turn the front flange and count how many times it turns until the driveshaft flange does one full revolution.

 

ur a star thankyou

 

on the 4 turn front flang it is at 20 to 4 any help

 

3.6 standard.

 

thanks top man