Here is an Aluminum Case Strange 9" Ford 3rd Member. It's got a 2.75 ratio Detroit/Eaton "Tru-Trac" mechanical limited slip differential. The "Tru-Trac" is a very strong and versatile unit used by most pro touring participants in road racing, autocross, and street driving. I've personally used them with 10.5" slicks and never broke one. I have other ratio's available including 3.0, 3.07, 3.64, 3.82, and 4.0 and will switch gears if needed. $1,050. + shipping.