Yah, I think a spool is the cheapest option going for power.. Otherwise, go detroit or air locker... Limited slips just don't do the job and lockrite I've heard don't hold the power..
look to Yukon for the best price on a full spool. I tried their axles and gearsets as well... twisted the axles but never broke one.. couldnt keep gearsets alive long enough.
SQHR I don't know what the planiteries are.The the ratio of the rear end and planiteries is 20to1 the finals with the gears in the profab are 1st gear is 20:1,2 gearis OD final is 18:1,3rd is OOD final is 16:1.
I don't think they were married.Give you a idea of the size of the axle