i just requested changing from 2way to 1.5way, i think it looked like 30/65
if the original preload on mine was 65-75ftlb with 2way ramps, its definately too high for street driving. was really noisy chatter at full lock which loosened the driveshaft nut and had a sudden on/off engagement.
the 30/65 ramp with i believe 30ftlb preload is alot more progressive.
if you can use the stronger non-speedo version, thats the best config cos it'll engage evenly left/right. dave said the one-sided lsd tends to tighten themselves during right turns like at roundbouts