theres a 7.5" granny cos limited slip diff on ebay at the moment - 3.64:1 i think the ratio is.

here is the link.....

http://cgi.ebay.co.uk/ws/eBayISAPI.d...sPageName=WDVW

or there is this one

http://cgi.ebay.co.uk/ws/eBayISAPI.d...sPageName=WDVW


heard that they were interchangeable with the 2wd cosworth ones - fish slap me if i wrong tho