Quote:
Originally Posted by Burt4x4
I ran a D60 rear in my K5 for about 10yrs. I had a Powr-Lok posi. Awesome pre-loaded posi! Acts like it's locked and when it does slip I found by mashing the brakes on and off while on the throttle makes it grab nicely! Precision Gear makes them now..they are origianlly a Spicer product and are adjustable & rebuildable.
The tightest posi out there in my option 
Here:
http://www.precisiongear.com/powerlok.htm
Good Luck
  
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I have this in my D60. I like it. I beat on it with a 454, 4:10s and 35's. Been great so far.