i have a borg warner 9 bolt diff with 25 spline axles & lsd center that is getting rebuilt as i write this . problem is it will more than likely brake when i run it on the drag strip. i have a 383 b motor stock heads holley street dominator manifold termo quad carb mopar purple cam stock converter pace maker extractors twin 2 1/2 in exhaust hp? car weighs around 3000 lbs , i need a diff strong enough to handle the next motor a 496 stroker with alloy heads & solid roller 600 + hp . in Australia 8 3/4 diffs are almost non existent as i have found out parts take for ever to make it here & cost so much more than over their in the usa . so i more than likely will have to use a ford 9in because parts are available every where . almost all tuff aussie cars have a 9 in . i am thinking about getting a diff built using 31 spline axles disc brakes Detroit locker or true trac center ? gears ? either 3.5 3.7 3.9 maybe 4,10 ? the b motor should go quite well with any of these gears & the 496 should really go & pull some very good mph . it is going to be a sleeper / cruiser i mean i will be just cruising around with other mopars in a pack but when the need be i can really step up to the plate . i will be getting the diff built over in the USA & shipped over , so that makes a 8 3/4 feasible but if anything brakes it will take time to get the bits & not many aussie diff builders work on them . any recommendations will be much appreciated