If it grips it will break a Timken "english" axle, they have problems at around 150lb/ft ... yes many have had more put through them on the rollers but thats a gentle increase in 4/5th gear, not dumped clutch @5000rpm in 1st. It will break either the shafts or the CWP if it grips, many on the road with skinny tyres last due to the fact that they break traction before the 150lb/ft is reached, and while the wheels are spinning the axle isnt under load.

The Best option is the Salisbury "atlas" axle. Fostek can build you a 48.5" plate LSD one not a lot... or build you a fully floating Ap braked rar end for ... a lot