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...