[BarryGMC]

Positraction is eatons and later gm corporate name for their clutch type limited slip used originally in cars and non dana 1/2 ton rears. Dana/spicer makes the four pinion power lock used in the dana 25,27,30,44,60,70. GMC used them often in the 44 and 60 from 60-66. You can still buy the powerlock and detroit for the danas . You also can get a new detroit locker for the old eatons if you use later GM 14 bolt axles. I run 3 detroits ONE in a 72 K20 eaton 1 in a 89 wrangler with a D44 and 1 in the 66 GMC D60.I also run 4 powertlocks the 60 and 65 gmc's And in a 60 CJ-5 The 72 also has a powerlock in the front d44