Rear end advice for racing with a 4 speed

I 2nd (4th?) a D60. Found out that an 8 3/4 doesn't like 4 speeds once a 3200 lb car start's hitting low 11's back in the early 80's.....well, it probably didn't like the 6k rpm launches :D but once the 60 was under the car, the broken 8 3/4 problems went away. Also, it doesn't matter much if you back brace the 8 3/4 since that doesn't stop pinion gear deflection much if at all.....and Roy is right about the weight difference. Don't know if he used a spool or not but that reduces weight too. Years ago I weighed a stock Dana 60 with LSD against an 8 3/4 also with an LSD and it was just under 50lbs difference. The 8 3/4 came out of an E body and the 60 came out of a B.