Hi I'm goning to be upgrading my rear brakes to sn-95 cobra disc,I want to upgrade my axle to 31 spline.I want to know what cars have 31 spline axle that i could us? thanks
strange engineering is the way to go. they have many types depending on budget and hp/tq figures. here's a link to the online catalog for axles: http://www.strangeengineering.net/catalog/46.html
keep paging forward to see the remaining 8.8 parts they have available. if they don't have exactly what you're looking for, call them up, they are VERY easy to deal with and extremely helpfull. i purchased my shocks and struts through them. good luck!
31 spline is an aftermarket thing. You will have to also upgrade the carrier to be compatable. A reinforced rear cover might be a good idea while your beefing up ther rear.