What can a 7 1/4 rear take???

I ran the 7 1/4 sure grip with 276 gears behind my 360 in my Dart for a couple of years with no problem.. burnouts and all.. I wasnt exactly kind to it.. but from what I have read and heard over the years, I was apparently lucky.. Though I believe if you just cruise the car and your not out beating the snot out of it everyday it should probably last a good long time.. I only upgraded because I got a good deal on an 8 3/4... LOL ..