I broke something in the stock sure-grip running 11.40s at 3700#. Found twisted axle splines when I took it apart.
Changed to a spool w/ 35 spline axles and all was good until I started running mid 10s at the same 3700#. It took the teeth off the ring and pinion. Car never 60 footed all that well (1.49-1.51) w/ a best of 10.40 at 129 mph.
Once that happened I put a Dana in it. That was in 2003...haven't touched it since.