Fbody69 nailed it. If the posi is "loose", you'll have one tire grap while doing a burnout, and you'll blow a spider gear and/or the pinion shaft, and the shrapnel will take out the gears & carrier.

On everyday street tires, the 8.2 will probably last. With large sticky tires combined with a manual tranny and a torque-monster 455, though, driveline weaknesses are quickly exposed!

I've personally blown up my 8.2, exploded a u-joint, and totally disintegrated the internals of a torque converter, along my journey to the mid-11's :-)

Lee Atkinson