Lockers for dragracing?

Hi Guys,

i put a Ford 8.8 in my Valiant, after some racing the traction lok did not work as it shoud. I put in a set of carbon discs, everything´s ok for maybe 2 years and not too much racing or street driving - less than 2000 miles. I was at a very good track recently, after two good passes with 1.57 60ft. the discs failed again...feels just like an open carrier.

I checked the plates, did not found major damage. I think it´s time to upgrade for the future, spool or another locking differential. Are these "lunchbox lockers" from Powertrax or Spartan suited for dragracing? All i can find is that the offroad guys use them successfully...these are not too expensive, setup is easy...looks like an alternative to me. With a spool i have to put in c-clip eliminators and have to setup the gears again.

What do you think?

Michael